An older (in his 80's) rider in our group had an electric drive added to his rather fancy touring bike "because the Alps are getting too steep." Probably a good idea for him for his annual tours in Europe. But when he rode with us on a really flat, rural bike path he'd either drop way behind (deliberately) and then race back up to us, or he'd race on ahead and then wait for us to catch up. He was showing off how much faster he could go than we could. I found him quite annoying and have tried to stay away from him since then.