I'm using red/green springs and Reedy 767 brushes on mine, and it's just as fast as any other stock motor on our track. I TQ'd today in the A main with it, in fact, on old brushes and without cutting the comm any time recently. I think the motor has potential... I'm just beating mine into the ground 'cause I figure a dyno-tuned version will be just around the corner.
I have mine geared at a 7.67 FDR in my Losi on an ozite carpet track. Comes off a 5-minute heat between 160-190 degrees normally (arm temp, not can).