Keep Fit/Activity Watch

Hello everyone, 

My birthday's next week and one of my pressies will be a keep fit/Activity Watch. Apparently they can do a lot of things. It can monitor your heart rate, and check up on a lot of your activities. As I'm currently doing a lot of daily walking and also I'm planning on some swimming (good job it's waterproof!) maybe even some cycling.If any of you out there have one of these keep fit/Activity watches, could you please let me know if they're any good. Are they easy to operate and understand?I must admit, I'm not at all technically minded .Still it beats wearing my Rolex I suppose?