Just an FYI--
I have a Polar S610 and when the battery was low I called Polar about making sure I will filling out the form correctly to send it in(you can download it)and the guy asked me when did I buy it--evidently my "warranty" had run out so he told me that I could just as well find a watch place close to home to change the battery(they have other location info on their website also), which I did and it works fine. I haven't had to get the monitoring chest strap changed yet though, I'll have to go thru them to do that I guess.
I don't use all the features, I'm more interested in the calories burned and the min/max settings type info, though I COULD download the info,(which is a great feature), but I don't use it. I always seem to buy the toys with all the bells and whistles just in case I want to use them.
Happy shopping!
Mary