Installed this motor into an ECX Ruckus with a Hobbywing SC10 70A ESC, and 5200mAh 30C GForce battery.
Acceleration is violent, with excellent midrange and top speed. I also appreciate that there's a flat spot to secure the pinion gear... I wasn't looking forward to having to grind my own flat spot.
I suppose the only negative so far is that the motor leads are quite stiff, and cannot be (easily) replaced. This doesn't impact performance at all, but it might be a factor for maintenance/ replacement.