If there are good ones out there for $125, what are the brands and model numbers? I'm not against saving money, I'm only reporting on what has worked well for me personally.
A lot of these motors may be called "servo" motors, but a true servo motor is a constant torque device with infinite speed control throughout the entire speed range. In other words, the less you push on the foot pedal, the slower the motor goes, all the way down to zero, and the more you push on the foot pedal, the faster the motor goes, all the way up to the motor's top speed. If the motor does not have that ability, it's not a true servo. The Consew servo does not have that ability.
No one lives forever, the trick is creating something that will.