Converted two bikes - mostly pleased with the results. A couple of hardware problems which were handled fairly efficiently by team support via email. They seemed eager to understand and solve any problem you may have. Battery development is on going which means new designs appear to be introduced quite regularly. I'm guessing when if do decide to upgrade the various connections will still be in place. As far as safety is concerned this is appears to be one of the best reliable batteries. We converted 4 years ago as we wanted a light-weight e-bike option. Used fairly regularly and still going strong.