Automatically going to sleep when you close the lid of the laptop and leaving it for a while is broken (machine stays "on" and eats battery), but this is expected behavior because Linux does the same thing. Suspend is unreliable, but again, Linux seems to have the same issue for whatever reason.
Video, networking, etc, all work just fine out of the box, have not noticed any issues there.
HVM (with Windows 7 as a guest, probably) is yet to be tested, can submit a followup when I get around to doing that.
The laptop slightly differs from "as stock" in that the SSD was replaced (it began having read errors), RAM was upgraded from 8 to 16 gigabytes, and the Optical Drive was replaced with a second hard drive caddy containing another SSD. These should be completely irrelevant to compatibility.