Talk about value for your money...I would have paid double based on the strength of this effect alone. This is a 'must have', seriously...and just plain fun to perform. It pays off BIG. Its beautiful is in its simplicity, and really, once you give it a bit of time to get it down, you'll want to do this often. As for difficulty, be more concerned about remembering the phases (lol...5 easy steps, piece of cake), because the card handling part is truly easy for anyone with the most basic card skill. Id highly recommend this effect.

This trick has 3 principals behind it's working. The first one I'll touch upon, is an extra card which needs to be taped to and then easily removed from another card. The instructions acknowledge the over stickiness of the tape, and suggest running it on your thumb several times. It's a fine point, but it takes some experimentation to get the right amount of adhesion on the tape, and also reducing the size of the piece. One does not want to 'pull' cards apart, as this would risk exposing the modus operandi ( at least one aspect of it.)
The second principal is classic, the one used in mental epic.
The third principal, deals with the backs of the cards themselves. This effect can be performed with the spectator having their cards face up, but-I believe it's a stronger trick when both sets of cards are FACE DOWN. To be able to do THAT, one needs to be clear of markings which are tiny and subtle. Lighting would need to be ample enough; I sometimes check beforehand, 'do I wear my glasses for this or no?'
Presented as the instruction initially indicate, it's strong-take the time to do the trick with face down cards, and it's even stronger. Not a trick to do straight out of the package, but well worth a few hours to get everything down.
I'll note that it's also possible, once you get the routine, to use regular playing cards to perform Symbolgic.
To me, this is an easy to carry mental gem, from a very influential master, Hen Fetsch. I definitely recommend this.