This is my personal opinion on this.
Some effects are more easily detected and look better on camera, in proper lighting, etc. This trick is one of those, at least I think so. When I watched the original demonstration I was worried about that, and a buddy of mine purchased it. Turns out I was right. I like the effect and all, I just wouldn't perform it for this reason. Don't get me wrong though, it's not nearly as bad as some artist put things out. I wont mention who, but I purchased a Magicians DvD on tattoo magic. In the DvD some of the effects were awesome, like printing parts from a bill onto yourself, or anything you wanted. Turns out this effect is mostly for the camera, or if the only lighting you have is by candle.