Yea, its hard for me to comment much as I haven't even seen the FCP X interface. I do know that Apple's Logic is an amazing platform for audio recording, production, and editing. It is truly a pro recording studio. It also functions a lot like FCP 6 in its garage band like use of visual drag and drop intuitive workflow, and they should complement each other very well. I thought it would take me 6 months to create a decent professional looking hd video with my own guitar music, video, and and samples. But, it only took me over the holidays to do that 15 minute short combining a lot of material in a pretty dense piece.
Now if I can just learn to make good dvs and blue rays without corruption I'll be totally happy and have no immediate need for a FCP upgrade, hopefully.