I agree with JimF22003. I have a 705. I have no real need for the maps. I do use the heart rate monitor and cadence only because i have them. I mainly use most of the functionality after the fact for my training log to keep records of miles and feet climbed and routes ridden. If you take into account the price difference between the 705 and 500 where the 705, once you add the ~$100 map, is double the 500, I'd go with the 500...