As there is no governing body that defines how servos should be rated, one cannot compare servos by the paper specs alone. e.g. the electronic circuit may be one that theoretically should deliver X amount of torque and Y amount of speed, but if the geartrain is poorly molded or cut and if the motors used are of inconsistant performance quality, then these specs go right out the window.

I have tested many servos from Grand Wing Servos who make the FMA servo (along with those from Global and a few other off name brands) and have found NON of them in the $50.00 price range could compare to the 9202 even though some on paper looked a lot better!!!

I have done these tests using a special board on which I can mount two servos across from each other with special servo wheels with pointers. Connecting both servos to a Y conector to the same channel on a receiver will alow you to "race them" for checking speed. The torque can be checked by having them lift weights over a simple pulley system) Not too scientific but very effective for direct comparisons. I would always buy at least four (usually 10) so that I had a good idea of their consistancy in manufacture also. And I found some of these even varied greatly from one sample to the next!!

And a spec that is never given is the one for reliability. Here the 9202 really shines. They are without a doubt the most reliable servo I have ever used.

As I haven't the time to check every servo out there, I finally gave up trying to find a cheaper, better performer with the same dependability and have just stuck with the 9202s.

Those you mentioned may be better then those I tested, but for the money saved on four servos can all be wasted if they result in only one minor crash.

Other product from FMA that I love is their Super Nova 250S charger and I hear great things about their Co-Pilot also. But neither of these have any mechanical moving parts.