CoreMelt has released Lock & Load for FCPX. If you aren't familiar with it, it was the best stabilizer for FCP. I've been stabilizing footage in FCP7, before using it in FCPX. It's that much better. Not to mention its ability to minimize the jello effect from a DSLR.
Now its out for FCPX. Check out the speed difference between it and the built-in. Compare for yourself:
http://www.coremelt.com/products/lock-and-load-x.html
Mitch Ives
Insight Productions Corp.
"Criticism may not be agreeable, but it is necessary. It fulfills the same function as pain in the human body. It calls attention to an unhealthy state of things." - Winston Churchill