I have a cheap one and it does what I need. Use it when ever doing cardio and works great so I make sure I stay in my zone. Sometimes I wear it when I weight train but it gets irritating. I like mine, miss it when I do cardio without it.
I've had 3. They've haven't broken I just keep buying better models. Polar is by far the best brand; they have the highest quality of all the HRMs. I have one that has a wireless bike computer built in and I can download all my workout info to my PC. I like gadgets. You can get some awesome models for $150. I paid $250 for mine. Here are some websites that have good deals:
It has been a great tool for me however I don't use it all the time. It is a good guide but you also have to learn how train w/o it. I have learned a lot w/my Polar notably it has really put me in tune with my body. You can e-mail or PM if you have questions about how to effectively use it during cardio. I've used one for 8 years. They're cool!!
I have one and love it. I don't really use it much anymore though. I should, because it's a good way to keep track of overall fitness and possible overtraining. Also good for interval training to gauge recovery.
I used it mostly as a motivator (back in the ol' days when I needed that!) It made my workouts more interesting, seeing how just a slight change in pace can affect the heart rate.
It was also a great safety net. Once I set the range, I felt comfortable because I knew I wouldn't wear myself out by going too hard too soon. It's also like having a personal trainer give me a good ass-kicking if I got too slow.
Gee, after reading over my post, I think I'll start using it again!
Get the cheapest model because all you really need it for is just to show you your heart rate. Some of them have alarms, etc... Just stuff you dont need in the gym. You can get one from walmart for $35 now!! Deal of the day!!! No need for anything fancier...