I used KDE twice at length and each time it ended up crashing to the point that I was unable to do anything but wipe my drive and reinstall a different distro and DE. Yes, KDE even managed to crash Slackware, the otherwise rock-solid distro. Other than that I liked KDE.

Right now I'm using MATE. Eh, I'm neutral to it. I was just DE-hopping for a while and most of them seem so similar as to have negligible differences.