Pretty simple UI. I use SpellAlerter for things like Kick and Pummel, as well as a few other things like Berserk, Innervate, Overpower, Lichborne, etc...
The best feature for me is the aura tracking over the class icons - it works for both my team and the opposing team and I can pick and choose what debuffs/buffs I want to see.
I tried to make it fit in the the Blizzard default UI appearance, though at one point, it was a complete mod, with Dominos/ButtonFacade and custom text/textures, I just got lazy.
Target castbar is right above mine, and a bit fatter. The focus castbar is in the middle of the screen. I don't really plan on going back to using Dominos, but I might look at some sort of condensed default actionbar addon.
Slight update.