Hi - I have been using the Windows 10 Technical Preview since October of 2014. It has definitely been a wild ride. Some months were good - some were not so good. But now Windows 10 is shaping up and runs very well on my Fujitsu TH700 tablet (4+ years old) (Pre-dates ultra-books, )
I have lived with it in production - running Hyper-V and doing my daily work on it. No retreat and no VMs here.
Build 10158 is pretty solid.
Build 10162 is really solid - not a single issue so far.
Screen Shot in action!
Take care, World Class! Jeremy Hajek