I bought one last summer.
I cooked a few things on it. I did a good flank steak on it that turned out pretty well (as part of a fajita recipe).
The key that I learned was to get the salt block very, very hot and minimize the overall cooking time. The block will definitely impart a salty flavor to whatever you cook (which can be good or bad).
I'm going to try some shimp skewers on it in upcoming week.
Enjoy... let us know how it goes!