Well I just added KDE to my collection of desktops and was disappointed in it's performance .... first it is running much slower than any of my other desktops ....
Gnome
XFCE
Cinnamon
I played with it for a couple of hours but like all new desktops it takes sometime to get used to .... I finally gave up in frustration as I could seem to make anything work the way I wanted (guess I'm spoiled by the ease of Cinnamon)
I haven't given up on it yet as I will go back sometime later .... LOL
Now the biggest problem was when I went back to Cinnamon some strange programs tried to load and my saved passwords in my browser were all gone ... that didn't happen when I installed XFCE ...
All in all not to bad but I'm gonna stick with Cinnamon ... LOL