Don't get me wrong, heart rate monitors are SO cool. Gotta have one, just to have one. But I found them very un-useful for Cathe workouts. I am always in the "zone" no matter what tape I am doing, and more likely, the stupid thing is beeping at me to slow down!!
I can see it being useful however for other things such as running or rollerblading where you don't really know. Or for real training. I have been working out long enough to know if I am in the "zone" just by rating my perceived exertion. I find, for me, a heart rate monitor is more useful in helping me SCALE DOWN my workouts. Like you can set it to beep at you if you are going over 60% of your maximum heart rate. This is really good at keeping your "easy" days easy. Without this, I know I would end up jacking it up to atleast 80%. You get used to doing Cathe cardio and you think that every time you workout you MUST feel the same way, the same fatigue. Which should not be the case.
Get one though. They are lots of fun. I only use the basic features, but like I said, am interested in using the alarm functions now. Training for a half marathon, I have to pay attention to keeping the intesity low on some days.
I have Polar A-5.
Janice