You can find the specs here:
http://www.hitecrcd.com/Catalog/Air/aircraft.html

I buddy of mine has a mix of 5645's (aileron's, elevator) and 5945 (rudder) on a 29% Edge. the 5645's are noticably slower finding zero. Meaning when you give control, the 5645 moves fast until it gets close to the proportional deflection then it slows. Where as the 5900 seem to move fast and more consistently.

I know these are programmable servos (deadband, center point,etc), but we believe that is not the problem. He wishes he spent the extra $20/servo and got 5945's all the way around.

BTW - The 5945's are faster than my 8 JR 8411's (and quieter -- and cheaper)!!!!

Just an observation...

-Chris