You have probably seen the penguin
video clip. If not it is definitely worth watching. Sankey is an awesome performer.
It look's very powerful, although I believe that just from watching the clip I have fully worked out how it's done. After sayiing that I don't think that a lay person would work out the method though as it seems to use quite a few principles.
My problem with itis two fold. First I would be worried about the complexity from the spectators point of view. There is a lot for them to remember. A card, a colour and a shape. We all have been in situations where they don't even remember the card least of all two other things. This of course could be sorted out by getting them to write down their selections as they make them. My other poblem is that perhaps it is a little magiccy for a mentalism set - but after saying that the final revelation is pretty strong, as in theory you have predicted something they just thought of.
At £8.39 though, it is probably worth buying just for the ease of it being already made up, although if it works as I think it wouldn't take much to make up a set.
If you want to know more - please pm me.