Used four of these in a 2-stage setup on a Falcon 3D printed pistol. They work great, shooting worker darts over 120' with honeybadgers and a 3S lipo.
Good value option over FTW wheels.
Built a MHP Pigeon using these wheels. No experience with FTW wheels but these work nicely, especially at half the price. Perfectly balanced and pressed on the motors with the right amount of force.
Loads of power in a small package, I got two sets of these for less than FTW wheels would have cost me.