There's one of each on my race team, so we'll see how they do. I like my stock body, fits well, is light, gets plenty of air over the motor, and looks good. Of the other two, one is very thick, a little heavy(but the marginal increase in weight really shouldn't be much of an effect) and is very strong. The last is right in the middle, but I prefer the style of my stock one better. Pics:
http://z6.invisionfree.com/Bug_Bite_...wtopic=15&st=0
and:
http://btrc-central.net/forum/viewtopic.php?t=396