We love the concepts and it has opened up a whole new world for us. My girlfriend had trouble riding more than 3 miles without the motor and now we go 60 miles in a weekend. We are thrilled with this invention. Unfortunately I can't give it 5 stars because her bike has issues that we cannot get resolved. The motor burns through batteries to the extent that I had to buy 2 additional batteries for when we take long trips. There is something wrong with the motor but I can't convince anyone that this is the issue. Other than this issue, I would highly recommend this product.