Thank you for the response, it's difficult to get feedback on this issue from actual users since the device is so new I guess. Very interesting. I've tried wearing it very snug, snug, and not-so-snug, too. Doesn't matter. On moderate walks, it's been recording well over 100 bpm, up to around 120. I've stopped and used my pulse to see what my actual HR is, and it's around 75 bpm. (I have a very low resting heart rate to begin with.) I'm beginning to think my watch is defective. I still have time to return it.