Try older laptops, I haven't been able to properly install a Geforce GO 6100 ( or 6150, or 6200, can't remember, either way a mobile 6 series), the Vista driver causes flashing browser windows/rendering problems of websites, and there is no official Win10 driver.
Also on my mums older lappy, radeon X1100 Mobilty, I've had enough problems with finding a Win7 driver, so I have my doubts about Win10. ( Otherwise the lappy is still more than fine T7200 and 4GB RAM, fine for home use).
Also, I still can't adjust the screen brightness with windows, only with my keyboard. ( this on an AMD HD5470)
How does it run better ? Benchmarks clearly show it's not faster in any way at all. It's very slightly faster in some things ( eg. PCmark or other benchies), and very slightly slower in other things (simple things like loading MS Excel or Word).
Looks wise I'm not a fan of the more ''flat'' look. I hated Win 8 though mind. Subjective obviously though!
Step in the right direction, I'm not sure, for the average user, perhaps yeah, all maintenance and stuff is done automatically and better than in 7, but for the power user, I'm kind of annoyed how dumbed down some things ( win updates for example) are. Not having full screen Metro is a major improvement, but other things aren't better imo. Especially all the ''Windows Store'' apps are rubbish, the built in Email client is rubbish, couldn't set many email accounts up at all ( they would receive mails, but not able to post), edge is still inferior to many other browsers, bloody xbox integration ( some of my clients were missing a normal offline ''classic'' version of solitaire or spider solitaire).
On my lappy I don't use any of the ''windows store/start menu'' apps, they do my head in, luckily Office 365 ( and its outlook) still works like it should, because the stock mail client is a joke, inferior to even outlook express from win xp. The multi taskbar is inferior to displayfusion ( no system tray/clock on secondary or 3rd screen). No ability to set an individual rotation of desktop backgrounds per screen.