Same for me as others in the thread - my experience has been mixed at best. When it works, it boots up lightning fast, the interface is clean and simple, and it doesn't try to be a smartphone with all of the "touchscreen interface even on a desktop machine" nonsense like Win 8 did. So that's all good.
Unfortunately it also has the stability of a balloon in a hurricane. Around 1 boot up in 4, every single piece of software I try to use will crash on first launch (although bizarrely most of them work fine if I persist and just re-launch them), the sound and network drivers will randomly fail, it loses internet connectivity for no reason, and about a bazillion other unrelated malfunctions come and go whenever it feels like it. If I restart at that stage, it then loses Cortana (no big loss for me, but unfortunately it treats this as important and won't let me just boot without a function I have never ever used!) or it temporarily loses my entire profile and gives me a completely blank desktop, or I get one of about a hundred different catastrophic BSODs, and I need to completely power off and power back on before everything works again. The other 3 times out of 4 by the way, everything works completely fine and stable, so that 1 time in 4 when everything's failing it just feels like the OS is fucking with me!
Related but different, MS Office 2016 is the most unstable, buggy POS I have ever seen, and I now dread receiving a document by email, because each time I have have to watch MS Word fuck up endlessly trying to open the file and then crashing. Even more frustrating of course is when it manages to actually open, but then crashes during a save file operation and thus loses any and all amendments I'd just made to the document. I would actually be more productive if instead of MS Office I'd installed World of Warcraft and attempted to outsource all my document changes from the General Chat channel!