Does or has anyone used the BodyBugg?

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I'm very curious of opinions on this? I've thought about getting it for a while, cause I love the idea of knowing exactly what I've burned all day. I have a heart rate monitor that tracks calories burned, that I suppose I could where every day like a BodyBugg, but the chest strap would getting annoying, and I'd be afraid the battery would die on it very quickly!

So anyways, just curious if anyone has it or has used it and what there opinion of it was? Thanks!