I have the GoWearFit (same maker as the Body Bugg) and have had it for 4 months now. I LOVE IT! I have to admit, I get TONS of questions about it, but I love talking about anything fitness related, so I have no problem explaining it to people. What I have found is the most useful for me, is seeing how different workouts, times I workout, things around the house, etc affect my overall calorie burn. For example, for me, a power walk on an incline is the same calorie burn as a 6.0mph run. Also, I burn just as many calories on my "rest" day by changing out my workout for housework. Finally, I've recently switched my workouts to evening, and noticed about a 300-400 calorie difference (burned less) throughout the day. All very interesting to know, for sure!
If you don't want to pay $200, check out Ebay. I got mine on there from a storefront that was selling open box items. Mine had been opened, but never used. No warranty on it, but I paid $125 for it instead of $200.