we have a gepedia e tandem with a bosch motor. between my wacky body and my wife who has not ridden in 45 years we we need the help. it lets us climb 16% grades with work crows around 18.5 pretty much under our own power. we love to ride now and we rode every day during the summer till winter hit. if we are tired we crank up the assist of not we work harder. we bought the bike in June and got 3000 miles on it by late fall. so far up to 52 miles at a time. we ride everywhere we don't own car and my wife is blind.