I use Windows 8.1 at work, and though it's more stable than the default Windows 8, it's basically the piece of inconsistent crap. It's ugly as sheet, it's slower at pretty much everything because of the metro interface, and most things are just harder to do.
The SINGLE thing that I like more about it than I like about Windows 7 is how the delete confirmation works: it doesn't ask if you're sure if you're sending stuff to the recycle bin, but you're deleting it permanently (SHIFT+Delete), it asks if you're sure. Apart from that, it's terrible. The whole "app" thing is infuriating, the "there's a new app for this type of file" is infuriating, the "open file with" dialog is infuriating, the network panel is infuriating, the control panel is infuriating, the explorer sidepanel is needlessly cluttered, as is the main explorer page, the whole start screen is bonkers and impossible to work with (yeah, you can search, but it's SLOW as crap), metro software is useless 90% of the time, and the remaining 10% are just infuriating, and the windows store is... well, I don't really know how it is because the two times I tried to open it, it just stood there loading, that little thing going round and round for more than 10 seconds, and since it's a metro app, it's fullscreen, so it's a fullscreen loading and you can't do anything else apart from staring at this stupid ugly loading circle of balls and I just ALT+F4 out of it because it's infuriating.
In short: avoid it like the plague. I've been using for a year and something now, and it's really not any better than it was. Apart from the stability, which went for unstable to mostly stable, when I installed 8.1. Mileage will vary, of course.