This is probably one of the highest torque motors you can buy. It is easily capable of pulling a M160 spring with a 7.4v LiPo, and pretty much any normal AEG spring with the low quality 8.4v batteries that come bundled with most guns. It can be a bit screechy under load, and will drain your battery fast when pulling heavy springs. The biggest drawback with this motor is that it is slow: 26K RPM max means you're looking at no more than 24rps under the best of conditions. In actual practice, you're looking at 15rps with a M120 spring and a decent battery. The positive is that you're still looking at 15rps with a M160 spring and a decent battery.
If you're going for a high velocity low ROF build, you could do a lot worse than this motor.
Super high torque
Relatively cool running
Great quality control; I've never heard of anybody with a bad Turbo 3K motor
A bit on the expensive side, considering Lonex motors are the same price
(although, to be fair, this motor has more torque than the Lonex motors)
Rating: [5 of 5 Stars!]