Yeah he is coming out with one but they did find a bug as the poster above has mentioned it looks like this will be a Test Rom on the Droid X if it Works I am guessing Motorola's Bootloader will no longer be a Problem for Droid X & we could see More roms/Over clocking Possibilites in the near future
these were tweeted by chevy yesterday:
ChevyNo1Droid
Step 1 complete - X is rooted
ChevyNo1Droid
RT: OK I won't lie - I can't put the f'n thing down. Beginnings of SS-X: http://chevyno1.richstevenson.com/Droid-X/beginnings.jpg 8:53 PM Aug 27th via web
This is an RC ROM and in my opinion not worth downloading/installing unless you want to be a guinea pig and want to help out by pointing out all the things that are wrong with it.
There's a few people that have posted at AD with the same problem about the SD card not mounting and now they're not even being able to load up their backup. I would suggest just flashing SBF and going back to the leaked Froyo release.