Pros : If you can get the glass to correctly acquire the mold shape, this makes a beautiful piece.
Cons : The mold looks great, but getting the glass to correctly acquire the mold is very difficult. When drawing your pattern, make the bowl of the spoon rest slightly larger & more rounded that the shape implies. You will need the edges of the glass to overhang the spoon bowl by nearly 1/4". Be careful of overfiring.
Other Thoughts : If you've done other shallow slumping, start with one of those programs and modify as needed to make a firing schedule for this mold. Remember that every piece of glass has a different specific gravity. You will have some successes and some "art". I've made more than a dozen of these and every one has turned out differntly - only 3 of the 24+ have actually correctly acquired the mold shape.