It is expensive but price say nothing about the quality of the product. The FX Hammer was sold for $3,900 and it was a piece of junk.
Sometimes system for $99 (not from Karl) is more worth than system for $1,000. When this system will get public the idea will lose a power. The only who wins is the seller.
Ask yourself why the author is selling it? Why he doesn't use it by himself?
If I would have an excellent wining system I would never sell it, but exploit it.