There are magicians who just put out quality, like Al Schneider. Not a lot, but good stuff. And then there are the quantity magicians like Jay Sankey. Most of what he releases is decent, but among all of this a few gems remain. And then there are those magicians who constantly release crap. Like Kevin Parker.
In an amateurish interview with newmagicsource.com Kevin said that he discovered his talent for creating magic tricks, after he created "Revolution" his coin vanish.
First: The idea is not really new.
Second: It is a bad idea to begin with.
Third: His execution made the method more obvious than it should be.
I talked to many magic friends. They all agree, that he can do nothing right. Stay away from his products. I urge you to.
Here is another thing. His website is no longer continued and all the YouTube videos of him performing have been taken down by him. So unfortunately I have no "proof" how bad he is. You just have to trust me.
But his own words might help you. In the interview mentioned above Kevin was asked:
Where do you usually perform your effects? Where might someone expect to see you?
"I only perform when I'm asked by aquaintances, or when I want to make a performance video."