I am a 41 year old mail from florida. In 2008 I weighed 180 lbs. and was diagnosed with a Dilated Cardiomyopathy and had to have a bi-ventricular pacemaker/defibrillator inserted. In July of 2009, I was placed on a heart transplant list and Doctors expected that I had "maybe 3-5 years" of use left of my heart. I got discouraged, and let my self balloon up to 217 lbs. In March 2011, I decided to try and do anything I could to get in better shape for a possible heart transplant. My doctors suggested I get a quality heart monitor to track my heart rate while exercising. I also wanted to track the calories I burned during a workout or walk/run to help me decide how many calories I should consume to lose weight. I purchased the Polar FT4 Mens, and it is awesome. The strap is very comfortable, it is so get set up and running, easy to use, and has helped me to lose 21 lbs. and 6% bodyfat. It has an easy to read display. It calculates yo! ur appropriate target zone, and beeps at you when you are not in it. Keeps track of your calories burned, your low, high and average heart rates, as well as the time you performed within your target zone. It is the perfect heart monitor for anyone, but especially for someone with heart problems. My recent visit to Mayo hospital was the best visit I have ever had. I improved so much that my doctors couldn't believe it. The want to re-test me in another six months to make sure the improvement wasn't short run. If I do well again, they are thinking I could be placed inactive on the transplant list. That means....I still have an enlarged heart, but with Polar's help, I have bought myself an extended amount of life. Thanks to Polar for making quality products that have given me the confidence I need to work as hard as I can without fear of over working myself.