It's done, I'm running 10. I did give into a few privacy / security things including the advertising. I recall seeing something that stated "install anyway" shortly after I checked my email and there was the notification...
One thing I don't think John Q Public understands about MS cloud distribution is that it uses your computer for storage and distribution of it's software. I also don't think MS was aware of how fast it could roll out win 10 could be distributed via this peer to peer method. Which is why they opted for reserving your version then waiting...
http://www.slate.com/articles/technology/bitwise/2015/08/windows_10_privacy_problems_here_s_how_bad_they_are_and_how_to_plug_them.2.html
I downloaded and installed win 10 in the late to early hours (2.am to 11 am) locally on a tuesday. Most people keep their computers running 14/7 though may not access them during that time.
Re drivers. Yeah I learned the truth about driver fixer apps and trying to keep up with drivers years back. Driver inspector fixer tools are a scam.
Codecs / decodec are the things that can make your life miserable (especially video) Vid and audio codecs get thrown out the window first on new installs cause microsoft can't maintain them all
My Window 10 machine doesn't have any music production software on it. It does have a few programs that I'll have to clear the registry and re register. No big deal, those programs are from my software company. It takes less then 5 minutes to clear all the software titles and get fresh keys for ten programs.