HI Beth:
I bought one a few years back so maybe the models are different. However, in my experience this product is not worthwhile. In fact I found it to be very discouraging. Things I did not like:
1) I do not think it accurately measured the calories I burn in a day. This value was computed on many values including body fat analysis that I had done at my local gym. My reason for thinking this was not accurate was based on the fact that I could loose 1.5 pounds each week more than the bodybugg would have predicted. I entered food quantities accurately and I don't think it was any discrepancy on my part.
2) The arm band itched and felt uncomfortable.
3) For me this product was the exact opposite of a motivating factor. It made me feel like I wasn't doing enough and also it made me feel like it was hard to set reasonable goals based on how the Bodybugg assumed I burned calories.
4) You have to pay for bodybugg and an online subcription. At the time this product was not mac compatible. Maybe this has changed. Not sure.
If I were considering this product I would use a nice heart monitor watch and pedometer instead. For me, the utility of this product was extremely low.
Meia