Picked up my SurfaceBook the day they were launched - there were definitely teething issues, sometimes the detaching process would fail, there were sleep issues (not sure if Intel cops the blame for that one).

All of these issues have been resolved with firmware updates by about 3 months after launch - reliability has been rock solid from then on out. Can't recommend it enough.

I picked up a Surface Book on launch day. i7, 16 GB, 512 GB. As others have pointed out, there were several software glitches for a few months after launch. Ultimately, the software problems have been worked out.

For me, the ultimate deficiency is the Surface Book's inability to drive two 4K monitors at 60 Hz. Although not promised in so many words during the launch event (they said "two 4K monitors" without specifying the refresh rate), I had assumed it would support 60 Hz rather than 30 Hz. This limitation convinced me to retire my Surface Book to a purely mobile role and use a proper workstation for 90% of my computing.

I expect that a second-generation Surface Book will resolve that specific hardware limitation.

They worked out the software and driver issues, so now it's pretty much fantastic hardware design with moderately good performance specs.

The only two (small) downsides that I run into regularly:

1. Some important software doesn't handle high DPI mode in Windows 10 well. Specifically Adobe offerings. Visual Studio 2015 has some small issues too.

2. The 3000x2000 pixel screen makes gaming a bit finicky. Games rarely support 3:2 ratios other than the native 3000x2000. The dedicated GPU is pretty capable, but not always 3000x2000 capable, so you're often stuck with 16:10 ratios that approximate 1500x1000.

Mine has been flawless so far, this is the newer one(performance base) with the discrete GPU.