I bought an RB .21 for my buggy last year. I was so impressed with the consistancy and ease of break-in that I decided to put an RB in my Tmaxx build as well. I had a little bit of a rough time getting her tuned over for the first time but after I found the right LSN position is was easy peazy. No stalling, stuttering or rev spiking. Just a perfectly consistant idle for it's entire first and second tank. The following few tanks went smooth as well and temps were very consistant. Mixture changes were predictable and not overly sensitive. I recently dropped an RB .12 in my GT2 to finish off my line of raceable nitro vehicles. I guess I'm sort of brand loyal when something impresses me. Same reason I run Futaba servos in all of my rigs. They've never let me down even when they could have. I've seen my $100 Futaba digital servos submerged in water and also had the case broken (not the ears, the actual casing) and both of them still work flawlessly after some dry time and a new casing.