Yes it certainly helped to log my progress.
It tells me exactly whether I am in my target heart rate zone. It's been especially helpful with Imax2. After each interval I would write down my heart rate and how I did.
Funny thing is when I would do sumo squats for instance I'd feel fine, not out of breath or anything, giving it my all, but my heart rate would go in the anaerobic zone. So you'd actually expect to be out of breath wouldn't you?
And if you're on a diet, it tells you how many calories you've burned. But I dont think that can be very accurate?
Dutchie