Destroyed my last computer in a crash, Cheap one. Still thinking of a 810 if I am doing some touring in the future. In the meantime is there any reason not to buy a used 500 than the usual buyer beware on used goods. Going forward am planning on heart rate monitoring and possibly getting a power meter. Use Strava and have not had battery life issues with my iPhone 5. Do like to have time and occasionally speed on view in front of me.