I've SP4 (i5, 8, 256) for three weeks. Nice piece of equipment with many bugs:
1. Display flickers during playing a video (YouTube and similar). Like an old TV loosing sync.
2. Edge likes to freeze the whole system. Nothing works, pressing power for few seconds helps (I need to log in again).
3. I have two accounts with Hello activated on both. When I'm logged in and my wife also wants to log in, Hello recognizes her and logs to my account. And vice versa. It's a bug or a feature?
4. I've strange issues with waking up. Keyboard light is on but mothing happens. After pressing power button I have to wait about 10 seconds with black screen before something happens. It's annoying.
But:
1. I don't have problems with fan. It started twice: during W10 big update and during Visual Studio installation.
2. Battery is so so. About 4-5 hours of standard usage (browsing, reading).
3. All cameras work fine.
ps. I've also new Dell XPS 15 and a lot of BSOD on it. What's going on with this new very expensive equipment? My 2 years old PC works without any issues under W10 (ok, I can see a few strange behaviors after connecting UHD display, but it's another history).