I have a Caster S10b too. It's a good sold (infact bullett proof) car, but is a cheaper version of the Hot Bodies Cyclone D4. If you go on-line and look at the old Hot Bodies site you'll see quite a few similarities between this car and the D4 Cyclone.
I'm not knocking it, just pointing out that it's not a completely new car. Just HPI re-realising it under a different brand/diguise
I was looking at running mine up north, but have decided to concentrate on 2wd. Think I'll be putting mine up for sale shortly.
PS: Have you rebuilt your diffs yet? I understand that the D4 locking nut assembly is a must!