I've been using it since the first draft relief. Build 10159 crashed the C Drive on my Computer.
Fortunately, nothing lived there but the os. I tried doing the recovery and that didn't work, tried
startup repair didn't work, so finally had to resinstall everything. It took a couple of days. But it
would have take a whole lot longer if I had to had to reinstall all of my samples and soundsets.
It has been perfectly fine for me, and the latest version is snappy and nice! It is a marked improvement
over Win 8.1, which was very stable for me.
To me, it's better to jump in with both feet and learn it, rather then live in fear and then sit back and
just go along for the ride...YMMV