Polar A300

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i wondered if anyone is using s Polar A300 and what your experiences are? After 2 failed Fitbit devices I have looked elsewhere and settled on Polar due to cost and Amazon reviews. Principally my fitness is walking about 5 miles a day and spinning 4 times a week whilst watching my calorie intake on MFP.
any feedback on the Polar A300 would be useful and how easy it is to link to MFP ?
How long is the battery life?
Accuracy of step count? HRM?

I have not seen the Polar software yet and am interested in users experience ?
Thank you
Simon.