Ok, for those of you considering purchasing it, let's clear a few things up that have been said:
1. The gimmick isn't "invisible." It's just made of an appropriate material (I'll leave it at that for the exposure-people....that would mean it could either be flesh colored, clear, etc... and leaves room for spectulation).
2. You end dirty. True. And while Kevin does "run away" in the preview, the clean-up is as empty as dumping the gimmick in a pocket or topit.
But is it visual? Absolutely. Even more so than factory sealed because the coin penetrates without any cover...ever. They see the coin and bottle in two seperate hands, they see the coin approach the bottle....and then they watch it penetrate without it ever leaving sight.
The gimmick is one you have to make, but it takes all of <10 minutes to make and you can get everything you need to make it for <$2.00.
It's actually pretty easy to do, but in the wrong lighting, the gimmick may or may not be more noticible. I've performed this a few times in the past, but don't really do it anymore. It ALWAYS gets a killer response.
Can you do it with a borrowed bottle? MAYBE under ideal circumstances, but pretty much, that's a "no." For the most part, you actually need to "prepare" the bottle before ever so much as approaching a crowd.
Is it impromptu? As said, it uses a gimmick, so no.
Is the gimmick reusable? Yep
Is the bottle examinable at the end? So much so that you can let them keep it.
It gains points for the visual-appeal and the impossibility of WATCHING the quarter literally melt through the bottle (the same is said of Factory Sealed, but again, it's not as visual as this). It looses points for the fact that you HAVE to use a gimmick...and it's really better if you approach the crowd with the bottle prepared.
Hope this helped clarify things