I've used Dinball and Ukrc. Both are very similar and I've had no problems with either.
I only use ~8.5t motors, I have 40c vampires and 50c Intellects of which I can't tell any difference. I used to use 30c Demons and they felt the same to me too. Maybe on a 5.5t I would notice a difference as the faster motor would be able to draw the extra current available from the higher rated packs??
