I recently picked up the heartrate monitor from MapMyRide. On sale for $49 seemed like a good deal.
It isn't. In fact, its junk.
I've used it three times and the readings are all over the chart. Doing a climb today it said my rate was 135...which is fine. But then cruising on flats it showed a rate of 224. It frequently shows a rate of 180-190...while I'm simply circling the parking lot.
If you're thinking of buying this monitor, don't.