I am wondering who has one of these and how successful they have been with it? Now I have to define a little more about what I mean by "successfull". I am aware that they work OK - they read your pulse ( not heart beat) fine when resting /walking --- but how well do they perform when you are really pushing yourself? How well do they track HR during the last 100 yards of hard 5k "race" or during a hilly 10K or when you are doing sprint intervals etc?
I find that my Garmin chest belt type HRM works well - is quite quick at recording changes in HR , doesn't give spurious results much ( sometimes!) - but I really would like to get away from the belt.