Switched both my work PC and personal PC over to Fedora KDE in the last year, and have loved every minute of it! Far better than GNOME, in my experience.
I also switched to KDE after trying Gnome and Xfce last year. It felt very mature in comparison and I was really impressed with the quality and stability overall. It had all the options I was looking for to customize the desktop experience to my liking and it felt like everything just worked. I'd say I now prefer KDE over Windows.