Essential to graphically view the data of Polar counter.

I use the bike meter CS500 +. Information is transferred very quickly on site "polarpersonaltrainer.com" where you can see his progress day by day.
Used with the meter and heart rate monitor belt, the site graphically shows the average heart rate, maximum and minimum of the session, the maximum and average speed, calories, percentage of fat burned, the slope and altitude, temperature etc ...
We can compare these sessions, the possibilities are rich and evolve, improving the site from time to time, by adding functions.
In short, it's well worth it to 30 in a product that quickly becomes indispensable.