I'm expecting to have to support it, so I went the Insider route on a tablet PC I have that didn't work for me with Windows 8. Happy enough with the results. I haven't yet found a program that doesn't work. I even got a Windows Phone (Lumia 640) a year ago, because I was bored of Android. That's running W10 too, and I haven't regretted it. (The "no apps" whining is largely bogus: half or more of the apps people complain about Windows Phone not having are basically websites in app form: just use the mobile website instead.)
I've supported Windows Server systems for years, and long wondered when someone was going to do an Internet-based Single Sign-On (SSO) service like a Windows Domain. That's basically what M$ did, though understandably feature-limited. No "roaming profiles": too bandwidth-intensive, and it might not be necessary in a "cloud" world.
I consider Microsoft to be on "probation", how they behave will determine whether I stick with Windows. From a career point of view, I might even go for W10 certification, just to be ahead of the curve - it wouldn't be a major pain to do, in my opinion. If they screw it up, I can still get work done on Linux. I'm not so "invested" in Windows that I would get upset either way.