It certainly works when you want to ring in a deck for card tricks from an empty tuck box.
However, you can use it to introduce sponge balls, rubber bands, coins, paper money, yada yada yada...anything that will fit into the box.
In fact, I use it more so for that other 'stuff' vs. cards.
As you mentioned, this forum is more of a Q & A venue...not a place to generate a 'thread' to discuss gimmicks/techniques.