I agree that there are some other good brands out there for outdoor. However, while this is obvious, but I still think the most significant factor in performance and race finishes is driver skill. I actually can't wait to run outdoors with my sc10 4x4. I always like referring people to the big outdoor race below that non-big name pro drivers won with an sc10 4x4 (northwest short course nationals).
http://www.youtube.com/watch?v=yzz0YHWs8dc
Granted, this track's traction looks decent for a big, outdoor dirt track, I think it still points to the fact that if you're at least a decent driver, you can still do well with this truck outdoors.
I personally think one of the reasons the big name pro's don't drive this car at every, big outdoor race is because they can't use too many aftermarket mods that make the truck better outdoors (i.e. exotek chassis, rcshox center diff, mtc toe block or strc 0.5 degree hubs).
Not to make another plug on the truck indoors, as we know it shines indoors. I finished fourth at my trophy race on a medium traction, small indoor track, and I'm an average driver. 2 out of the top 4 were sc10 4x4.