Servos: Digital, FET or standard?

[Chillout47]

I have been racing a long time, but I have never really got my head around servos. I spent £60 on a KO fet for my touring car along time ago, and don't get me wrong, it has been superb, but I have recently started off road again, and to keep the initial cost down I bought a Bluebird servo for around £20 off feebay to go in my B4. I CAN'T TELL THE DIFFERENCE!!!! the cheap Bluebird has been excellent. What the hell? I am only an average driver, so maybe I just can't notice any difference, but the speed is great and it always centres spot on and it has excellent build quality. Are we buying expensive servos for no reason? some servos are around £100!! you can get an excellent spec Bluebird for £16. http://www.blue-bird-model.com/en/servos/bms-631mg.html Please let me know your thoughts....

Cheers, Mark.