wow, they are brilliant, hit wilkos today and got one, six pound! bargain, 11 different functions! i was well impressed, my new little gadget, me and my mate set it up at like 9 oclock tonight, and we were belting it up and down the road at the fastest we cud ride to see whos max speed was the highest!! was a great laugh however my pants got ripped when they got caught in the chain at full speed haha. i would definately recommend any cyclist to get one, great little gadget!