Been using W10 off and on for sometime now Jo and I like it. Very stable, extremely quick to boot and shutdown (using an SSD, which it's optimised for) and so far, nothing there I don't like. I don't bother often with the Metro Tile interface and still use a traditional desktop most times, but will probably change over at some point - or flick between the two. The increased speed people experience with W8 is not just new hardware, it's the O/S - mind you, download/install loads of free crap and it'll soon sloooow down and folks will still blame the O/S. Once people get used to 8, upgrading to 10 won't be an issue at all and being a free upgrade, what's not to like?
I wouldn't recommend using a 'shell' personally, it's very simple to boot 8.1 to the desktop, but Geoff has a habit of bloating his machines out with third party software, so each to their own. I know some flat earth types here don't like change
It's very beneficial to learn some shortcut keys with W8/8.1, makes the O/S even more of a joy to use.
http://www.shortcutworld.com/en/win/Windows_8.html
http://windows.microsoft.com/en-gb/windows/tutorial