Depends on your requirements. If you are flying shockies with Cd roms around 5 or less OZ's then the cirrus 4.4 or GWS picos are your best shot. If you are flying just about anything bigger I would go with HS 55s or similar. GWS servos have less slop than the cirrus 4.4s but as you go into larger/faster planes the GWS's have the least torque. IMO as always..