Tower servos appear to be Futaba or Hobico in disguise, at least for some of them. They seem to work fine for the guys I know who have them (I have 4 "standard" size ones).

There's no problem mixing and matching servo brands to get the servo with the specs you want on the control surface you want. I fly a mix of JR, Hitech, Tower, and Hobico, and just got a single GWS/Polk servo.

Check out www.servocity.com for good prices on servos and FREE SHIPPING that makes it reasonable to mix and match things around.

(I have no affilication with servo city, I just buy stuff from them once in a while)