Okay, so it's been a couple of weeks now, and I figure an update is in order.
Right now, the only remaining issue that continues to irk me is the lack of a 'favorites' link on the start menu. I theorize (in the admitted absence of any actual data) that Microsoft wants you to start up your browser first (which defaults to their supplied landing page) then choose faves from there. The old way, of picking a fave directly, allowed you to bypass the landing page. That's my theory, anyway. The other is that the decision was made by a moron. Your choice.
But, other than that, it's working quite well. I know other people have complained about lock-ups and so forth. I haven't had any, but that may have something to do with the amount of effort different brands put into making sure their drivers are bullet-proof. Again, just my theory.
I continue to think that the start menu is the weakest part of Windows 10. They made design changes that, in my view anyway, took a good system and made it less good. If they'd included a "windows 7 emulation" mode, I betcha it would be the most-used Win10 option on the planet. The fact that they didn't probably says something.
But there are lots of things to like. The multi-finger gesturing system with the touchpad, as I mentioned above, is a great improvement. The screensaver slideshow is awesome, and the desktop background-changer as well. I find the lock/unlock screen handling an improvement over Win7, although not really revolutionary.
For the rest, it really just looks a lot like Win7. As with every single Windows release since 3.1, they move stuff around, both on and off the control panel, so you have to re-learn where some admin functions are located. Like I said, though, nothing new.
There are a couple of utilities that I think I'm going to appreciate, like the Phone Companion. But for the most part, most of the extraneous shit that comes with the new system can just be deleted. Again, though, that's not really Win10's fault. That crap's been around since XP.
ETA: The virtual desktop system is a HUGE bonus. Definitely worth the price of admission.
My overall vote is a thumbs-up. I don't think it's an improvement like Win7 was over XP, but it's also not Vista or Win8.