I decided to buy a Polar one because it syncs with the cardio machines in my gym. If I wear the chest strap, the machine will read out my HR, even if it doesn't have sensors. If the equipment in your gym says 'Polar heart rate ready', then Polar monitors will work with them.The model I picked is an F6. I wanted one that's 'coded' - that means it won't pick up the HR of the person next to you if they're wearing a monitor. In a big spin class, that's an issue. The F series is designed for calorie counters - other models (the A's?) are more for ruuners and have all sorts of cool features that a runner would love.
Like I said, I'm not an expert at all so if you're interested in Polar, check out their web site and for info on other brands, you might be able to find some comparisons using Google.






BUT it said I DID!!!