Apache,
Please do not tell any of the guys at my field that are using the S-148 with the 240 that it is too slow. Otherwise they will not be able to understand why it is working.
The slower the servo, the less gain can be used, but it will still work. And speed is not the end all and be all.
Foe a better understanding of how they relate read the two articles in the hints and tips section of
www.leisuretech.ca web site on servos and gyros.