The Bodybugg is really a nifty tool for those interested in their caloric expenditure. I know for me, I always felt the impression that the online daily calorie counters that you can use seemed to always be too high for me. I would gain when I would eat the amount they suggested that I would maintain on so I decided to get a Bodybugg for a while to see if they were really accurate for my body and it turns out that they really were telling me more than what my body actually maintains on. The Bodybugg helped me easily see that in actuality, my BMR (or Basal Metabolic Rate, ie. what one maintains on without exercising) was about 200-300 calories less than what online calculators would tell me. It was nice being able to use a tool like the Bodybugg to figure this out, because it didn't require any effort on my part really aside from just wearing the band around all day. Yes it did get a bit annoying sometimes to wear the band because it isn't necessarily the cutest accessory around, but the information you gain makes it worth it. The only other downside I would say would be price, because you have to subscribe to the online website (which is the only way you can see your results) so that's kind of annoying. But again, I think it's worth it even just for the short term to see what your body really burns in a day.