I have several models with Dymond D5000 ($15) servos, all seem to perform very well on my sport flying models up to ST 3000 engine size down to Kadet Sr with Saito 91, they are a lot cheaper than Savox if you don't fly big models or helicopters that need digital hi speed servos. but for most Sunday afternoon sport flying like I do they are just right. They also have digital servos at reasonable prices also if that's what you like. Look them up you might like them.