Check our blog about a rather big project here:
http://fcpxmegatest.blogspot.com/
we won´t be able to do it all in FCPX, because we miss audio-outputs etc, but until the last finishing touches we try to stay in the new tool.
we are now at 5400+ clips and it runs relatively smooth after a few hickups early especially with more than one machine used and we needed to work out a new workflow. by relatively smooth I mean it works....and FCP7 would not be smooth anymore with this project either. In fact I doubt I would be so far in FCP7 yet.
check it out
