I still have my A-BB motor (well, all the pieces of it anyway, they are currently scattered among something like three different motors
) Honestly, I never found that motor to be that impressive. I didn't find it to be nearly as fast as the X-Speed I had. It is basically an X-Speed armature in the Auldey can though, isn't it? That's what it looks like to me. I couldn't understand why it seemed so slow, when it sounded so nice outside of the car.
If the right mix is to put them in a very fast motor, then the 25 turn armature should have been the right choice. It seems to be too extreme, though. All top-end and no torque at all. If the stage 2 motors were really turning 30000 rpm (I know, they really aren't) then this motor turns more like 40000-45000. It's that much faster.