Ive got a 3 star setup in an RTR XXXT and.... it's a lot of motor for a 2WD truck. Get the setup right and with a bit of grip tho and it absolutely flies. The tracks i run on are pretty short so its geared down fairly soft, but allows you to utilise the ridiculous RPMs these motors will provide.

Havent had any dramas with the system yet (touchwood). Gave it probably 15 consecutive packs on friday arvo/evening without skipping a beat.

I imagine you'll hear good and bad opinions on the quality of these two systems and the support provided by retailers/manufacturers... all im saying is that ive had no problems with mine over the past couple of months. And it's quick!