So far I'm mostly pleased with the product, and really wish I'd had it a few weeks ago when I got hit by a sidewalk at 14mph. The one critique I have is in the axle bearing retention design. The included washer as well as the face of the retaining nut for the axle are too large of diameter for the provided bearing. Tightening the axle bolt results in the wheel not spinning as the washer is pressing on the outer bearing race instead of just the inner. Support suggests not tightening the axle bolt, and that the controller will prevent it from backing out. While I agree that is a true statement, it seems a poor design choice that would be easy to rectify.