I tested the stock servo at 6v and 7.4v, then I try the 1/5th scale Injora servo at 7.4v and 8.4v. The Spektrum stock servo is really bad at the stock 6v, but when a BEC at 7.4v is added, it really comes alive. The Injora servo wasn't faster than the Spektrum stock one, but was clearly stronger. When testing on the rocks, it was really hard to get the servo to stall, and most times would move the whole rig side to side.