I have an Echowell HRM which has died because both of the main buttons carked it. So I wrote to them (apparently they've dropped out of the HRM market) to get instructions on how to open the case without buggering it up.

Nearly fell off my chair when they wrote back saying they would send a replacement unit out!! No if, buts or beg pardons. In fact they were most apologetic.

Top effort, should be more of it. I wonder if Polar will replace my 10 year old XT?