- It is huge and unwieldy, like a cafeteria tray (and comes with a sizable power brick)
- The touchscreen doesn't have an oleophobic coating, so it becomes a smudgy mess within hours (unlike my iPad, which looks pristine for weeks despite being even more heavily used)
- The screen seems dim or washed out no matter what I try (then again, I have a retina MacBook at home...)
- Battery life is poor(ish) on the i7 model. I can only partially blame all the corporate junk we have installed.
- Wi-Fi seemed flakey at times (and you need a proprietary dongle for Ethernet)
I've seen the 2016 models (which don't improve on the above) and they share the good bits:
- Very decent (if somewhat mushy) keyboard, with lots of travel (perhaps a bit too much)
- Relatively lightweight (considering the size)
- Pretty decent touchpad (not on a par with a MacBook, but good enough for three-finger gestures, although maddeningly imprecise at times)
- Despite the color/brightness issues, the HIDPI screen is sharp and readable under Windows 10
- The fingerprint sensor actually works (but doesn't hold a candle to TouchID)
- DisplayPort or HDMI output (depending on model, mine has both, and I use my Apple dongle for DP->VGA)
I disabled TrackPoint within a month due to RSI (I used original IBM laptops for years and it was a recurring issue for me).
TrackPoint is much more precise than the trackpad for accurate positioning, but I'd rather carry a Bluetooth mouse and retain the use of my fingers (whereas I'm perfectly fine with the Mac trackpad for drawing diagrams and pixel-level positioning).
Edit: Oh, and I run Linux on it through Hyper-V and Docker, since I need to run Windows 10. Had no trouble booting a couple of Ubuntu/Elementary Live USB drives for playing around, most of the hardware seemed to work.