Pleased with the concept of converting an existing bike to an e-bike. I paid a bike mechanic to do it. Early on, we started having issues with the control unit/battery delivering consistent power to the powered wheel. Erratic Power delivery would usually start at about the 60% power level remaining in the battery. The customer service was usually very good, especially with us being thousands of miles apart! Swytch did end up replacing the power unit after having me try several different things. Looking back, I think that part of the issue is a slightly underpowered charging unit for the battery packs as I have since started using a charging unit designed for an Aventon e- bike.(with very close supervision!) And both battery packs seem to more fully charge and the power delivery is spot on clear down to below 40%.