Magic Tricks

First of all this is a great effect to add in many card routines. I am a big fan of adding magic moments during the performance. I am not sure I would perform this during a classic card celection routine, since the cards used for this effect have to be really worn out and I wouldn't use cards like that for a normal performance.
However, that doesn't mean that I wouldn't use this. Doing this in the right time for the right people can be amazing. I would perform this between routines to add an extra magic moment. I can see how this can be a real reputation maker for somebody if performed properly.
Having said that, this illusion will take practice to be performed convinsingly. Don't expect any gimmicks or hold outs when you buy this. This is pure sleight of hand. Yes, it requires very basic card manipulation skills to do the basic move, and some more advanced sleights to add a couple of extra convinsers, showing your hand empty back and forth. I don't consider this to be a negative though. Among all these self-working "miracles" that come out every day, it's good to see a nice illusion that is accomplished just with sleight of hand. After all, magicians need to be good at sleight of hand and this is a good opportunity to learn something new or brush up something that they haven't done in a while. It's worth it.
Don't think that the sleights involved are extremely difficult to pull off. It will take practice to master it and perform it flawlessly (and that's the only way it should be performed) but if you are not a complete novice you will be able to do all the moves pretty quickly.