I've yet to have any problems with ace/xp servos as well. They are rock solid and are underrated as far as torque is concerned. For the price its hard to beat them. Hitecs are great servos, but if you can't afford the $150 for a decent servo price tag then ace/xp is a great alternative. There are tons of people here who use them and is evident by the fact they usually last less than a day on the buy/sell threads. And the fact you can buy a good used one for around $50-60 shipped adds to the overall value of them.