Varies on a person's experience. Some slate the Sabtertooth ESC's others love them, depends how you treat them. Scorpion's tend to be good all round, though they occasionally have strange happenings when it comes to interpreting signals.

Many people will say though to go for a pair of TZ85A from Botbitz. Treat them right and they should last years of heavy use.

Thats me, but wait and see what others say.