My Bionx Xtracycle has regenerative breaking and it is as implied super-useful as a speed moderator here in SF when going downhill with a load (my two kids) wou

My Bionx Xtracycle has regenerative breaking and it is as implied super-useful as a speed moderator here in SF when going downhill with a load (my two kids) would build up speed. It's firmware limited to 20 mph which _feels_ slow but is probably a sane compromise. We only hit that going down hill, and are far from the fastest cycle; but we average 12-15 mph on mild uphills and flats when conventional cycles usually average a few mph slower. I love my ebike, it makes a daily commute taking two kids to school then getting on to work feasible, regardless of weather or relative personal energy level.