Quite sound e-bike! The sole downside would be that the throttle isn’t as “snappy” as being the Surron X for instance. The throttle is pretty gradual, as you get to like 12mph it's possible. Also, I have an issue a couple of loose o-ring on among the fork legs. I https://ontopicdirectory.com/listings12805060/getting-my-surron-usa-to-work