GWS in giant scale???
I bought several of the 100oz servos and even under 6V their slow...They also do not center consistantly good enough for 3D, but I have them in my Big Bingo, aileron, rudder, elevator and they do a fine job there.
I had them in a light weight Razzle and didn't care for them at all.
I think the added weight of the control surfaces helped them to center better, I don't know why but that's my experience.
At $12.50 each for a 100OZ servo it was too tempting to pass up, if you know what I mean...;^)