having been a fcp head for years, fcpx was refreshing, it looked great, felt great, that is until..
your video went past 5 minutes..
numerous glitches with plug ins, constant crashing, stupid timeline rules, so i bit the bullet and forced myself to use premiere..
best editing programme i hav used to date, dyamic link is a god send trust me!
The latest version has been stable for me and I run over 2,000 high end plug ins including Apple ones. It's great for videos an hour or longer.