This guy is really cool, IMO. I'm testing a SubRoost Acro/Unburden set and it's been working pretty solidly. Being lightning fast and having powerful dual STABs with awesome coverage (hits nearly everything aside from Aegislash) is wonderful. This guy, though, can also run BU or SD sets well, meaning it can do more than simply clean up or provide momentum.
Choice Band (maybe even Scarf to revenge anything offensive) makes him really threatening and he has a great movepool for it (as long as it gets some more decent fling STAB), with cool coverage and U-Turn. 110 base speed, even without unburden, makes this guy instantly pretty good by putting him above Terrakion, Keldeo, and base 100s; tying the Latis, etc. so it can get by pretty well.
I could even imagine something like Natural Gift+Berry to beat Skarm and Aegi before cleaning up the rest of the team, once a meta is established. And don't forget that Limber is a really good ability for non-Gem sets, as you can crap on a whole bunch of walls like Ferro or Celebi that would use it.
This guy's stats, moves, abilities, and typing make it an extremely versatile and competitive pokemon, and I think it'll be at least low OU (and could probably see ban in UU).
Plus, who wouldn't sh** their pants if a luchador swooped down on them from the sky and dropped them on their face?