It looks pretty cool and easy to use. Here are some pics of going through the process starting with after you have sewn the grid:
Pretty neat, huh? I can think of several projects I'd love to try this on, but I haven't found it at any of my LQS and I'm certainly on the lookout for it now. If anyone has used this, please comment as I'm interested to see if it works as easily as Moda says it does here (they made a Patriotic Pillow using this technique).