Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Unblievable heart rates
Review: This monitor seems to require just the right conditions to work. When I used it on an elliptical trainer (the Gazelle, whose own pulse monitor seems to show double my heart rate most of the time), it gave believable readings, not too far from ones shown on an Omron sleeve-type blood pressure monitor. But when I used it on bike rides, or just walking around, even after wetting the chest strap (not easy to do constantly when you're out in the park and its cold or you don't want to pull up your sweatshirt in public!), it gave very weird readings, when it gave any (half the time it just says zero): a rate of 67 when biking up a steep hill, and rates of 120-160 when just standing next to my bike, relaxed and admiring the views from Central Park! This happened so much I gave up and returned it.
