Got one of these for customer stock and to test out. Realy impressed with all the functions, far more indepth and accurate than other brands. The main reature is the Fitness Test. This is a 5 min test first thing in the morning while your in bed. Just put your chest strap on and start the fitness test. The FT40 then calculates your heart rate in this time with your personal setting to give you a fitness score. The more you train the better the score gets. You can see a graph in the trends function. Very good product worth the extra £35 from a FT7.