I agree all of them at one point or another has a issue, but my Baja, I have yet to have a problem with it.
It's a Rovan and that actually surprises me because of the cheap price it is. This is the very reason I recommended them to anybody looking to purchase one.
I don't remember what my first one was but it was nitro.
My worst was the Redcat Tornado S30, A pile of junk honestly.
My best, is the rest.... ;)
Probably a toss up between my Xmaxx and my Baja 5b gasser.