Been running Plasma 5.3 on Kubuntu for the past few weeks and I am really impressed, and this is coming from someone who has never been much of a KDE user. I tried to like KDE 4.X but I always seemed to go back to a GTK based desktop after a week or two (LXDE, MATE, XFCE, and Cinnamon being most often used). But this may be the desktop that pulls me over to KDE. It is beautiful to look at and the lag I always hated in KDE 4 is gone. Still on the cutting edge (ie a few quirks) but mostly a big bundle of awesomeness.