I always try to find some things that differentiate the 'Mons, and I think this one has a few selling points, potentially, over others. Its way more aggessive than Suicune, doesn't have Rocks, Ground, or Rock weakness like Volc, and is quite a bit bulkier than Keldeo. I think that being able to run mixed is a very slight boon to it, but I think that U-Turn is also very attractive when compared to other things like Gastrodon or Suicune or Toxapex etc. :) I will have to see how bulky this thing realistically is, and how much it's ability actually hinders it (doesn't appear to be a whole lot tbh).
Also, that's quite surprising that it takes place at the end of the turn. It seems different compared to thing like Emergency Exit, Defeatist (iirc) etc. but very good for it!