Read this: Our own review of the Surface Pro 4 with the Skylake Core i5 CPU.
Microsoft Surface Pro 4, Core i5, 256GB
Specifications

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Average of 11 scores (from 18 reviews)
Reviews for the Microsoft Surface Pro 4, Core i5, 256GB
Source: KL Gadget Guy

If you are already looking to buy a Surface Pro 4 in the very beginning, then you will be glad to know that this refreshed model is definitely a better performing model than the previous one, with better performance and battery life. However, what the Surface Pro 4 offers isn’t compelling enough for me to recommend one, given the fact that the model we have here costs RM6,568, you already have many alternatives for a lightweight Windows machine, such as the HP Envy 13, Acer Switch 5, Lenovo Yoga 720 and more, all of which costs lesser than the Surface Pro 4, not unless you value the form factor and Surface ecosystem, I won’t recommend this as a great option for a premium Windows machine.
Single Review, online available, Short, Date: 01/07/2018
Source: Unlocked Newegg

The Surface line has had the distinct advantage of being one of the first to the 2-in-1 party, so Microsoft has had ample time to work out the kinks. For the most part they have succeeded, especially when it comes to the high performing, beautiful tablet portion. The keyboard is sufficient, though not exactly a game changer. I would recomend the Surface to someone who wants to use it primarily as a tablet, with only occasional typing. They keyboard isn’t quite there yet, especially when it comes to the clumsy detachment process. The Surface Book addresses this issue beautifully, but the high cost might be an issue for some.
Single Review, online available, Short, Date: 09/26/2016
Source: Techradar

Has Microsoft at last crafted a tablet that can reasonably, without considerable compromise, replace your laptop? Short of going back to the drawing board on the battery, this looks as close as it's going to get.
Single Review, online available, Medium, Date: 09/21/2016
Rating: Total score: 90%
Source: PC Pro

Overall, though, Microsoft really is pushing the Surface Pro line along nicely. There isn't quite enough here to make me want to upgrade from a Surface Pro 3, but it’s a good, solid update, and it remains the hybrid that sets the standard. If you have the money, and want a hybrid, buy it.
Single Review, online available, Long, Date: 01/04/2016
Rating: Total score: 100%
Source: PC Perspective

The hardware design is superb, the hardware configuration is top of the line for this generation, Windows 10 is more than capable of handling the high DPI resolutions and there is no bloatware to deal with on the Surface platforms. Other than the eccentricities of the designs (Type Cover, hinge), price is the only thing that you can really complain about on either the Surface Pro 4 or the Surface Book. If you want flagship Windows notebooks that combine design, style, technology and performance, both the Surface Pro 4 and Surface Book are the best you can buy. If I were picking one to keep in my bag going forward, I think the larger screen and discrete GPU option on the Surface Book would make it my selection.
Comparison, online available, Very Long, Date: 12/21/2015
Source: Stuff TV

When Windows 10, and its Continuum mode in particular, runs without a hiccup this is a five-star product. Microsoft didn't need to tinker with the Pro 3 much to ensure it was a winner. All that was required on the hardware side of things were some modest refinements: a larger, equally pristine screen, a faster processor and a pen that wouldn’t go missing at the bottom of your rucksack. As good as the Pro 3 was, running on Windows 8.1 made it a stopgap product. Now Windows 10 is here, the Pro 4 should see Microsoft’s hybrid vision fully realised at the fourth time of asking. After spending the best part of two weeks with the latest Surface, that magic moment has patently gone missing. It's a product that grasps defeat from the jaws of victory. When an update comes along and fixes the issues I've been having with the Pro 4, I'll happily reevaluate it. At the moment, I'm left with a hybrid that I can't trust to work properly.
Single Review, online available, Very Short, Date: 11/26/2015
Rating: Total score: 40%
Source: Trusted Reviews

If you have the money, the Surface Pro 4 is the best Windows 10 tablet available. It offers a bright, crisp display, great performance and solid build quality. Paired with its Surface Pen and optional Type Cover, the Surface Pro 4 becomes a fully functioning laptop that will meet most people’s personal and work needs. However, I’m not completely sold on its value as a professional design tool. The fact that Microsoft is also charging an extra £110 for the Type Cover, where most other PC and tablet makers are offering keyboards for free is also an annoyance. Buyers on a strict budget who don’t need top-end performance could find a better deal with one of Asus’ Transformer Books, or Microsoft’s own Surface 3.
Single Review, online available, Medium, Date: 11/23/2015
Rating: Total score: 90% price: 80% performance: 80% mobility: 80% workmanship: 90% ergonomy: 90%
Foreign Reviews
Source: Connect - Heft 9/2016

Single Review, , Length Unknown, Date: 08/01/2016
Rating: Total score: 81%
Source: HardwareLuxx

Single Review, online available, Long, Date: 12/12/2015
Source: Mobicroco

Single Review, online available, Short, Date: 11/24/2015
Rating: Total score: 96% features: 95% workmanship: 98% ergonomy: 98%
Source: Computer Totaal

Single Review, online available, Very Short, Date: 11/19/2015
Rating: Total score: 60%
Source: All About Phones

Positive: Slim size and lightweight; good display; nice design; long battery life. Negative: Relatively high price.
Single Review, online available, Long, Date: 04/11/2016
Source: Fredzone

Single Review, online available, Very Long, Date: 09/25/2016
Rating: Total score: 90% price: 85% display: 95% mobility: 90% ergonomy: 95%
Source: Meilleurmobile

Single Review, online available, Medium, Date: 01/21/2016
Rating: Total score: 80%
Source: PC Lab.pl

Positive: Slim and light; very good performance; fantastic display; Pen included; easy-to-use; comfortable keyboard; efficient cooling system; good sound quality. Negative: Only one USB port; short battery life; expensive.
Single Review, online available, Very Long, Date: 02/05/2016
Source: Chip Online TR

Single Review, online available, Short, Date: 07/18/2016
Rating: Total score: 76% performance: 83% display: 86%
Source: Notebook-Center.ru

Positive: Excellent design; balanced weight and size characteristics; good performance; and high-quality display. Negative: Poor connectivity; short battery life; expensive.
Single Review, online available, Medium, Date: 01/27/2016
Source: Dinside

Single Review, online available, Very Short, Date: 11/25/2015
Rating: Total score: 83%
Comment
Series:
Both the Microsoft Surface RT and the Surface Pro never really made it big and couldn't compete with its Android and iOs counterparts. A large reason for its low sales figures was due to the unpopularity of the tablet-notebook hybrid category itself. However it is important to note that the Surface Pro 2 is actually a full blown laptop acting as a hybrid. For a start, it comes with Windows 8.1 backed up with an Intel Core i5-4300U ultrabook class processor, 8GB of RAM and up to 512GB SSD. It looks and has the same dimensions as the first version making both their accessories compatible with each other. However, there's also the new optional Type Cover 2 which adds backlighting but is on the heavy side and is rather pricey.
The good thing about the surface is of course its ultra portability and undeniable performance. With its specs, it will quite likely outperform many other ultraportable laptops and hybrids. Also not to forget is the fact that it comes preinstalled with Windows 8.1 and has all the necessary built-in ports making it an actual laptop and not just a replacement. The primary I/O, the FHD screen is also accompanied with an included active stylus. The downside to all this is definitely the asking price for the tablet and detachable keyboard combination. There may be some serious competitors giving almost if not the same kind of specs for a lower price. Its kickstand, although improved, is still a letdown as it doesn't conveniently sit on a lap despite being a laptop. All in all, the Microsoft Surface Pro 2 is worthy laptop if budget is not an issue.
Intel HD Graphics 520: Integrated GPU (GT2) with 24 EUs found on some Skylake CPU models (15 W ULV series).
Modern games should be playable with these graphics cards at low settings and resolutions. Casual gamers may be happy with these cards.
» Further information can be found in our Comparison of Mobile Graphics Cards and the corresponding Benchmark List.
6300U: Skylake-based ULV dual-core processor for thin notebooks and ultrabooks. Offers an integrated HD Graphics 520 GPU and is manufactured in 14 nm.» Further information can be found in our Comparison of Mobile Processsors.
12.30":
This range of display format is largely the upper limit for tablets and the lower limit for subnotebooks.
The advantage of subnotebooks is that the entire laptop can be small in size and therefore easily portable. The tiny display has the added advantage of requiring little power, which further improves battery life and thus mobility. The disadvantage is that reading texts is exhausting for the eyes. High resolutions, which one is used to from a standard laptop, are almost not usable.
The same applies to tablets in this size range.
» To find out how fine a display is, see our DPI List.Microsoft:
Microsoft smartphones and tablets have been tested since 2012. There are many reviews with average ratings. The reader's interest is quite given, but the market share is not big enough for the Top 5 smartphone manufacturers (as of 2016).
80.55%: This rating is slightly above average, there are somewhat more devices with worse ratings. However, clear purchase recommendations look different.
» Further information can be found in our Notebook Purchase Guide.