I have had a lot of people recommend it, and I have gone to a couple of threads on it, and still don't have a clue what it is.
What is it?
What does it look like?
How does it work?
Have you seen this sticky from Leahs? It includes tons of info, including photos http://www.cakecentral.com/cake-decorating-ftopict-603925.html
The Sticky is at the top of this Forum.