I really really enjoy doing this trick. If there is a downside to it you have to carry around tags
and a hole puncher.
The "Gimmick" is very clever and easy to make.
I have, as most
people will, changed up the presentation a bit. I noticed in the demo video he replaces the card
from the back, but there is no reason you can't load the card in from the front. Also, after the
card is replaced, I ask them to hold the tag very tight, and I just take half a step back, and let
their card be pulled out.
After you put the card with the tag on it back into the deck, the
trick is done. No funky moves. You could have one person hold the deck and another hold the tag.
The gimmick can be added into the deck, and removed with minimal effort. Although the deck
can't be held up to close scrutiny, the gimmick is not very obvious.