I'm curious, too. A friend of a friend, both physicians, had it and was pleased with the results. Said he gained both length and girth, but never told my buddy how much.
Take a look at this post. For me, it helped a lot with my Peyronies Disease. I have no bend at all now and increased my circumference of about 1/2 inch and about 1/2 inch increase in length. This treatment is expensive however.