As evidenced by the timeline that shows release of cards at approximately the same time, and the Castle USB card having a different API to the Iyonix up until recently?
This is despite Castle advertising, for example, scanning bundles for the Castle card which didn't work (and I understand didn't ship) until several months after the Iyonix shipped. I picked up a lot of disgruntled Castle customers because of this - we ensure that we can ship as soon as a product is announced. The fact that I was drawn in to price-matching a product which didn't exist is incidental.
These are facts, and I'm concerned that I shouldn't really be the person to have to state them - I'd assumed that people were aware of the situation.