dola, to clarify/give more detail (I didn't see Ben had asked specifically), I already had a Garmin watch and the HRM that came with it. The heart rate monito stopped working/became very unreliable after just a few months, and some googling suggested that the strap for the Garmin HRM was shit, and that Polar straps are much better, and compatible with the Garmin HRM. So I bought a Polar strap and have been happy since then. So I have a Garmin watch, Garmin Heart Rate Montior, and a Polar strap, and it works just fine. I don't know about any other sort of combination as far as compatibility goes.
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