I have use this product for run and biking workout for a little while , and I have really enjoy its functionality . although a little bulky , it be a great training tool and provide all need information . the only real negative of this watch be its lifespan . as I be train for a triathlon , the watch just quit working . it work fine one day and then two day later , it would not turn on . I could get the watch to turn on when it be on the charger and plug in , but as soon as it come off the charger , it would shut off and would not turn on - the obvious sign of a rechargeable battery that will no longer hold a charge . I understand that this happen to rechargeable battery , but I feel that this quit long before the watch reach a reasonable lifespan . base on the rate of use , I would estimate that I make maybe 50 charge of the battery -lrb- probably fewer -rrb- . each charge get I about 3 workout , so at Garmin 's suggest retail price , that work out to pay $ 2 per workout to get this information . the watch be nice , but not worth $ 2 a workout - a gym membership would be much cheaper but I do not like treadmill or stationary bike . I be currently look for a different product and would recommend other do the same .