"I have two of these units and had very good luck with them. Mind you though, I used them some for something other than bicycle propulsion => Kiddy car propulsion! For this type of application they"... (read full reviews)
"Overall, this item is very economical and practical. The initial cost is sadly, overpriced for what you get. Ideally, the price would be lower, the distance travelled for your charge would be longer"... (read full reviews)