So far I am happy with this watch, which I have only worn once. It has useful functions. The reason I have not given it five stars is that the functions are rather complicated, and it will be hard to use it without referring to the manual. This is my first Casio, and I find my other running watches (Timex, Nike, Polar, Garmin) more intuitive. But I am very happy to have a solar-powered watch, because getting my old watch re-waterproofed when the battery is changed cost more than this new watch.