I did wear the HRM for 24 hrs to see how many calories I was burning throughout the day. It seemed pretty low as it didn't really record my increase in heart rate from just walking. I did some research on what could the reason be for that. I guess I read that HRM are really meant for tracking your heart rate during moderate activity. And they're really about 80% accurate during activity.
So, then I went back to the Bodybugg and looking at the technology and whether it works or not. I read several white papers and the research showed different calorie monitors and their accuracy. I can't post a link yet but you can find on the internet.
I decided on the Sensewear (maker of the Bodybugg) and have had it since November. I continue to use the Polar F4 pink HRM during my training and compare it's calculations to the one's provided by the Sensewear unit. Depending on the activity, they compare relatively well. The lacking algorithms on the Sensewear is on the Elliptical trainer, I haven't tried the bike yet.
I use the Sensewear unit to ensure I get enough activty in during the week as I have a desk job and that's killing my metabolism. (I originally got the Sensewear to monitor my activity over the weekend because I was worried I wasn't getting enough activity on the weekends because I tended not to work out and take care of the boys (2 & 3-1/2)) Boy I was wrong about that! I'm way more active on the weekends and end up having to get a workout at least 500 calories a day during the week just to stay on track!!!
Overall, I think both are good tools to help you depending on what your goals are....I will continue to use both for my training!
Good Luck!!!

