I am happy with W10. I upgraded to W10 on the first day that the Insider Preview was released months ago. One issue for me is that under Sign-in options, it won't let me change my Windows PIN and I have to sign in with my MS account password, which is a little bit of a pain 'cos it's quite long and complicated and I often make mistakes entering it.
Something I realized this week is that my Pro 3 is still running W10 Insider Preview Evaluation Copy (build 10074) whereas when I upgraded my home PC from Win 7 to Win 10 a couple of days ago, the version of Win 10 on my PC says Windows 10 Home (i.e. no build or version number). Is anyone else running something more advanced than the Preview Evaluation Copy on their Pro 3? I check regularly for updates, and maybe I'm expecting a bit much to think that MS will push through a finalized version of Win 10 for those of us running the Preview Evaluation?