Personally I've read spannermonkeys thread and whilst to a certain point it looks like it has improved, we don't know whether the shop has newer stock and personally I believe/know you can get much better? ?
The self build was the one I had and whilst yes it helps to get used to it and is good fun to build there are better things for not much more money
Solid, reliable model that's reasonably quick too is the hpi firestorm, forum favourite and can cope with rough and tumble
Plus if you really want to build it you can always completely disassemble and build it up again!