i've got a thunder tiger st-1 RTR version. not too much difference between it and the pro version. RTR just doesn't come with the carbon fiber shock towers, radio tray, and a couple other things that were CF. also the pro comes with some red anodized parts and i think all the rear toe blocks. i think. pros: it's a strong truggy, i've had it land on its roof from ten feet up and not break a thing, only i've really lost was a couple screws. CONS: the on/off switch could be inside the radio box but it sits on the outside, stock servos are strong but slow, stock body is very thin in some areas, and that's about it. very good truck out of the box for either the pro or RTR. very competitive on the track too. some people will tell you to get the extended wing mount because the wing mount that comes with it is used as a rear body mount. but actuall you just need to get two more body posts and put them on the rear shock tower and you can use the mount then.