Yes...stay away from the Pro 4.
I sold mine after a month for two reasons:
1) Got sick of having to scrounge for parts. The parts situation has gotten better since then, but not much better. Parts are pretty spendy, too...arms come in f/r sets (
), so it's $10 for a front arm or $10 for a pair of c-hubs (ridiculous)
2) It doesn't seem to take a hit very well.
(a)I stripped lots of bevel gears -- and they don't just lose one tooth...and they're a pain to change compared to other shaft cars.
(b) They tweak VERY badly with a hard hit. Supposedly some people have come up with a bunch of mods to help this somewhat. Smack a barrier and you find yourself trying to adjust steering trim during the race...not good.
If you don't hit anything, it's an awesome car. It was a nightmare for me.