OK, I'm now on Windows 10.
I reinstalled 7.
I installed updates up to Service Pack 1.
Immediately after installing SP1 and rebooting, I checked for updates.
The Updater updated itself. And broke.
So, I spent all night last night trying to fix the updater on a clean system. No love. I manually installed every patch that's supposed to fix the updater, in order, and none did.
Soooo . . . I tried installing 10 with updates disabled. Still jammed up 25% through updates.
Found out that unplugging my DVD/Blue Ray drive might help with that. It did.
Just finished installing 10.
So far, so good.
I still have a few apps and games to install, and a few more annoyances to track down and disable, but so far so good. I don't mind the overall look, and it seems fairly fast.