You mean the bodymedia fit? I have one- love it
I had it since it was called the gowear fit.
Pros- I love seeing how much I burn and how much I sleep at night.
Cons I don't really see except I have the older model that's not blue tooth like the new ones so it doesn't sync to my phone I still have to plug it in to see the information. One thing I don't care for is their food tracking system though- I'd rather be able to import my sparkpeople but it doesn't let me.
It is cheaper than the bodybugg and also there is something called the "fitbit" which is cheaper than both that you might want to check out