Ive been tinkering with ElvUI a bit and I quite like it, the only thing that really really triggers my OCD is, that it seems Ive got something messed up.
Ive had different "versions" of my UIs now and plenty of times i get the same bug. The Healthbars/Manabars of Targets, ToT and occasionally PLayer overextending into infinity!
Heres some examples
How I want it to look like
Buggy Healthbar on dead targetted mob
earlier version of UI. NOTE Target of Target Frame mana bar extending into infinity