This is a nice trick, it's pretty easy to do and ends clean, but the real value here is Paul's
presentation.
I like the premise of offering them the option to hold onto the prediction
for as long as they want. It reminds me of J.J Abrams TED talk on the Mystery Box. I've been
fascinated by the idea of incorporating it into a magic trick ever since I saw it in John Allen's
book, but I never did anything with it. This is the first time I've seen a presentation for it that
I liked.
The price is a bit higher than I would think it should be for what you're
getting (I would probably have charged $5.95 for it), but this is a nice trick you will enjoy
performing and your spectators will enjoy watching.