I have been using the 9150 servo for some time. I am about the order the 9154 replacement gear sets for my 9150 because I want the extra speed to improve snap performance. They are a great servo and I wouldnt hesitate to recomend them. As Earl stated the output gears are huge on these servos so wear on the gear train is not an issue I have had to worry about.

I am not knocking the other manufacturers but I have found that the gear wear on Futaba servos generally to be much less than JR servos especially when it comes to the metal geared versions. IMHO the futaba's are best.

Peter

P.S I am not sponsored so I have the freedom to choose whatever product is best.