The SP4 is without any question the worst, most unreliable, computer I've ever owned or used.
Previously, I had an SP3, and although it had its flaws, it was one of the best computers I've ever owned. (I'd say an old pre-Lenovo IBM ThinkPad would take the cake, there...)
I regret having the SP4 in my life at all, as mine simply ALMOST NEVER wakes when on battery power, especially if the keyboard cover is attached. I had to force power-off and reboot on mine TWICE this morning. This is completely unacceptable, especially for a device sold and advertised as usable for quick note-taking in OneNote. This is the 21st flippin' century: sleep/wake is just supposed to WORK!
I really want to love the SP4, but I've come to the conclusion that it's a giant steaming pile of gooey, stinky **** that neither Microsoft or Intel is capable of fixing, nor is either company even willing to own up to the very serious problems with Skylake in the SP4 (and apparently, the Surface Book as well...)
Like I said, I really want to love it - but I HATE THIS COMPUTER - IT MAKES MY LIFE MUCH HARDER AND MORE FRUSTRATING!!!! Obviously, that's not what I buy a computer for.
BTW, I'm on my second SP4, after my first one got so corrupted (after I had to force power-off and reboot) that it refused to run ANY modern apps, including Settings, Activity Center, or even the Start Menu. The Microsoft Store tried for two days to fix it and finally gave up and swapped me out for a new one. I got this one on 2/17, so it immediately got the 2/17 firmware update, and has been a living **** the entire time I've owned it.
This is the most frustrating, least useful, and least reliable computer ever...