Well, Build 10147 was short-lived, like 2 days, then another, a week, then Build 10240, which is probably going to be the final version for release.
The new start screen takes a little getting used to, but is functional, albeit somewhat busy. Most Windows 7 and
8.1 programs work in W10, Favorites can be imported to the new browser, Atom.
Avast anti-virus works like a charm on W10, and all the drivers work. My AdBlock doesn't, yet, but it is open source, so someone should have a version for Atom. The user interface on Atom is different, but works nicely. It's still smartphone-ish, but even I got used to it.
All in all, the whole package works well, the transition is fairly seamless, and everything but the ad blocker works.
If you decide to try Windows 10, be sure you can re-install your current OS, in case you don't like it. As always, backup your files before the install.