well that's a different approach -- recommending a clutch over a servo.
As far as servos, i tried the Rex version of the family sew that everyone recommends from Toledo -- didn't like it (thank god for amazon return).
Bought the sewquiet and it's perfect. Better pedal control and i can do stitch by stitch without messing with additional pulleys.
Considered the consew because i like having separate controller for top mounting, but the reviews i read on it were pretty bad, so I didn't bother.
Not sure why everyone jumps on the family sew bandwagon, but to each his or her own. Maybe it varies based on machine.