In addition to the obvious high little useful chest strap are as weaknesses before the low battery life mentioned, the poor readability of the display (reflection / glare, GPS weaknesses, bracelet is very stiff and tear after about a year usually, and especially the sub-optimal service Polar. Must batteries are replaced in the arm, you have to send in the clock, which usually takes weeks and costs too. For women, the clock is also arg clunky and big.
Conclusion: Adding to this, what you still have to buy for the foot pod and transferability / Synachronisation with PC to there are far better alternatives for little more that have not even above disorders and display even create time next to the current run data ..