I agree with many of the comments posted. The Swytch is fantastic, especially for those of us who are getting on in years & find climbing hills is no longer possible without an electric assist. I am thrilled I can keep my comfy bike with this simple add-on; it allows me to get to places via bike that were impossible before; pure freedom, pure joy. I had a long wait for the kit during covid, communications were frustrating during the covid period, but things improved after the covid delays eased. I did receive a faulty sensor, but Swytch came through with a replacement sensor & I am a happy camper. The pedal sensor does move around with vibrations, despite their “cinch strap” & glue pad”, so I have put a bit of sticky-tack around it to both hold it a bit more securely against inevitable road bumps & vibrations, while also allowing me to nudge it, to where it lights up again; this holds it there a bit better than the strap & glue pad have done on their own. You do still have to check the light is engaged from time to time, or you may find yourself riding without the expected “assist”.😉 I have yet to test how the battery does in really cold, wintry weather, so can’t comment yet on that aspect. I, too, would like to have the second (back-up) battery & especially the lighter smaller version just released, but it’s a bit too pricey for me. Maybe in future, they will offer a better discount to existing customers.🤞