I'm not a UFC person. I've been told by those who are UFC people that the Fightpass is worth it.
It really, really is. Hell, I think it's worth it for the library of past fights alone. The only thing is, I'm a bit more of a boxing fan than an MMA fan. Don't get me wrong, because a good fight is a good fight, but I've always found boxing just a bit more compelling. ESPN Classics shows old boxing matches from time to time. If they had something similar to Fightpass, I might jump aboard.
The alphabet soup of boxing organizations is pretty frustrating sometimes. That a lot of the really "must see" fights are on PPV is a bit annoying as well. To be honest, I've pretty much stopped trying to keep up with both boxing and mma, though I'll still watch fights when I can. Sports in general take a lot of effort to keep up with.