Some users have reported issues with the Surface Book due to its 2 in 1 design. Firmware updates have resolved most of the issues with it, but there are still reports of problems with it in that respect. I personally am looking at the Surface Book as my next PC if any of my current devices fail. Right now, I am happy with what I have.
What I would recommend you do though is wait a bit more, because rumor is Microsoft will release a conventional Surface Book laptop. This is said to not be a 2 in 1, which might have its benefits of not being as complex. It might also be more affordable and familiar to use. The touch pad gestures in the latest Windows 10 Creators Update are somewhat similar to what you find on a Mac and you can customize them too.
If you can up to October or November then make a solid comparison between Surface Book 2, rev 2. MacBook Pro (which might be cheaper), then you might benefit even more. If you can't then the still reliable 2015 MacBook Pro is still a solid buy.
Not to counter, rather more first hand experience; I bought my Surface Book later in the cycle (November 2016) all the terrible scenarios I had read online have never occurred or realised; Detach works perfectly, my ultra wide LG "just works", no "Hot Bags" doesn't consume battery while sleeping, wakes from sleep/hibernation with no issue, just no problems at all. To date my Surface Book has proved to be the most stable computer I have ever owned, it has literally never crashed or presented any issue. so far the experience is "everything works as promised" by Microsoft, both in isolation and with peripherals. FWIW over 2 decades with Apple & the Mac, never been a hater of Windows, however Microsoft certainly have my attention and now custom these days.
So what I would say is let the dust settle as little on any new product and allow the manufacturer to work out the kinks, as seems to be the trend that on the initial release some issues are present, regardless of point of origin.
Q-6
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I am not sure but I think the cost of Surface Book is almost the same as the MacBook Pro.
Locally I priced a 256Gb i7 non Touch Bar 13" MBP, it was $63 USD cheaper than my i7, 256Gb, dGPU Surface Book. Arguably the Surface Book represents better value being a 2 in1 with full Pen & Touch support and dGPU. Had I opted for the 13" MBP with Touch Bar & i7 pricing would have been greater than the Surface Book.
Personally I am hoping that Microsoft launches a 15" Surface Notebook, as I have a suspicion that it may well solve my problems, given Apple is on autopilot, and no longer providing usable solutions for my needs.
n.b. This assumes one takes advantage of the 2 in 1 features.
Q-6