Cat SX, Out of date?

[outtafocus]

I may have the chance to buy a virtually brand new Cat SX locally for a good price.
My question is, will the SX be worth buying? I know nothing about the Cat line and I dont want to end up with an old car with no parts.
How different is the SX compared to the SXII?
Do many parts interchange?

I have been told that its mainly bigger shocks on the SXII and a more LiPo specific chassis also.

What do you think?