I switched to Premiere when FCP X came out, after I lost hours of work repeatedly due to crashes, and no way to save, and never looked back. Did they ever fix the issue where there is no save button in the File menu at all, and no way to save whatsoever, other than leave FCP X open for an hour for AutoSave to do it automatically, which is retarded?
I'm sure FCP X will be good one day but I can't imagine it doing everything that Premiere does. Sure, the interface is pretty, but it's slow as hell.
The complicated "Events" way to organize files is just horrendous too, and it forces you to create a whole new structure for everything, even if you just want to try out an effect and the discard it. It gets so confusing.
Background rendering is also a horrible idea, as it slows down the computer and you have no way to know what the hell is going on. In Premiere, there is NO need for rendering at all to play your timeline, which means there's no background slowness or anything like that, it just works, instantly.