FWIW I'm getting 107bpm sitting at rest on the computer. That seemed high for a at rest reading, so I dug out my old workout Sharper Image All-In-One watch to compare it. Sigh... Haven't used it in over a year and the battery is dead. :-(
I was getting readings in the high 100's like you last time I played with it. I know my heart rate wasn't at 180bpm, so maybe we all need to try this feature out and report in. If they are all high, then we might have found a bug under the rug.