Don't be too quick to ask your doctor about getting one, though. For one thing, the jury's still out on how well it works. People with a test Maestro only lost 8.5 percent more excess weight in a year than people who had dummy units, and the FDA wants EnteroMedics to conduct a five-year study to see if its claims match reality in the long run. Also, your health insurance probably won't cover this -- you'll likely have to pay for the device and surgery. If Maestro does work as promised, though, it could be a lifesaver for anyone whose weight issues are normally out of their control.