Hi Mark, yes I have imported media from FCP Studio to FCPX, just to see if it would work, and it does. But frankly when I've got the work loaded and started in Studio I just stay there. I haven't done any serious editing yet in FPX, but what I have done, ( when I can get the media to load ), has been ok.
For now and for me though the "paying work" stays in Studio. That works, I'm familiar with it and I haven't had the time to re-learn editing using FPCX. I'm hoping Tom, ( Tom Wolsky ), has a FCPX book in the pipeline that will be yet another of his excellent guides to these Apple programmes......Do you Tom?
Regarding your question as to whether I've seen any weird effects on some FCPX images I have found in the past with FCP or Avid that it's best to output any part of your edit that exhibits any "weirdness" to finished format and then check it, most times the moraying or strobing goes away on final output.
If you are working in FCP Studio on a MacPro with a Kona or similar card then of course you can use a reference broadcast monitor to check to see if any aberrations will be on your final output too.....I don't think we can do that yet using FCPX, (?).