I loved using my Swytch kit on my last singletrack ride with my teenage son. I only turned it on for the bigger uphills at first and then kept it on for the last parts as I was getting more tired. I'm finally able to keep up with him, go uphill, and still breathe despite my asthma, which allowed us to ride for 2.5 hours with some stops. I'm still getting plenty of exercise, as shown by my heart rate, and for much longer than usual. My next goal is to replace short car rides with bike rides. Installation took a bit longer than expected, having to file down the axle a bit to fit my fork and getting the pedal sensor to fit properly.