I've had my Tonaro Compy nearly a year now and done about 1000 miles without fault and with no obvious loss of range.I still love riding it it as the 8 gears,3 assist settings and throttle control give so many different ways of riding it and the hill climbing is excellent.It is surprising that no-one else sells a throttle controlled crank drive.I wouldn't swop it for anything.Usual disclaimers.