Becky Worley reviews infomercials for ABC. Here's her thoughts on the 'invisible tummy trimmer'. (No, she is not wearing it in the photo above.)

At first, I wasn't very impressed with the Tummy Trimmer. It's a tubular girdle, and as a result it doesn't stay in place very well. It slides up along the bottom, creating some unsightly rolls around the beer-gut area. Also, it promises to work on back fat -- which it does, but it also creates a weird roll at the top of your back where the girdle ends. If you want to be serious about flattening and tightening like this, you need Spanx or a girdle that has a mechanism to stay in place. But keep in mind those cost considerably more than the $20 that the tummy trimmer costs.

The saving grace for the Tummy Trimmer came when I found a pretty cool way to use it: I wore it over the top of my jeans, where it helped to rein in my muffin top by streamlining the transition zone from tight jeans to loose hip flab. For that reason, I kept it in the B range.