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As a professional broadcast and film editor I have never been asked to post anything in FCPX. There were times when someone would just want to experiment with FCP5 or 6 or 7, and they had me cut on those systems from time to time.
The industry has always been Avid, and in second place was usually Media 100, Adobe Premiere or FCP.
Now, I say that to say this: I'd never EVER swear off an application that you feel comfortable using. I've used FCPX and I have to say that it's the fastest of the NLEs I've ever used. Once I got past that learning curve I knew why some folks like it.
Cut on what you know PERIOD. If someone is paying you to cut on something else LEARN FAST. It seems to me that you don't have any intentions on going professional with your editing, so have fun, and enjoy good software.