I have the Slave I from 2010 so the UCS one doesn't excite me as much as it could have if I didn't own it.
I'd probably feel the same way, as that set is pretty good as it is.
But... I don't own it So... this is amazing
I still need to get a Bossk though, since he came with the 2010 set. Granted, he's not important to the Slave I itself as far as the OT goes but I do need him to round out my bounty hunter collection, which is nearly complete.