I bought this for my 10 year old son (well actually he gave me a tenner, so I made a tidy £2+ profit - nice). The instructions weren't very easy to follow, but with a bit of patience and about 1-2hours, we were off and running. He really likes the features and the info available - especially speed! The following day we went off for a 47.89 (!) mile ride, and I was kept fully appraised of speed, average speed, time in the saddle, mileage etc etc by my son (great). Most of the data resets when you hold the button down, but the clock and odometer don't (unless you press the reset button on back) - perfect. It is a neat little unit, and I think I will buy one for myself now (at this price, why not?).