From what I heard the 330 kit has a couple prototypes out there. There is another thread on RMS that talks about this kit. There is also a lot of threads about RMS and how their software normally isnt the greatest. Check the archives.
Personally if you live close to RMS and you can take your car into their shop for adjustments then by all means go for it. I have heard that you will definately will be doing this a few times.
I think the ESS system is a better product however. They have a larger company and have the R&D in their software already. It works well.
Since you have the 330 you might pm DonDon and see what his opinion is of ESS.
If you also have an interest to get a system before the end of the month you can save about $900 with the ESS system.
http://home.attbi.com/~kbleck