I'm getting a solid 8 hours of work on my SurfaceBook and I disagree with the sentiment about it not feeling premium, imo, it feels premium to me.
My usage is Capture 1 and/or Lightroom - I'm deciding on which one of these I want to use, office apps, some virtualization (virtualbox), RDP and gotomypc. Additionally my kids use it for homework and YT videos.
YMMV but the SB has been solid performer not getting any issues.
I know many people hate the SurfaceBook but I think its a great laptop and it fits my needs a lot better then the current MBPs. Just last month while in a hotel, someone tripped over the cord to the laptop and thanks to the easy disconnect of the powercord, the cord just harmlessly dropped to the floor. If that occurred on the new MBPs, it would have been in pieces. Plus I can easily plug in my SD card to transfer images, without needing to add to my collection of crap I need to travel with.