Great component and I would not mind paying for it.
However, if you are going to claim that it has 'Accurate Card Type Detection', you need to make sure that you cover common cases.
E.g. I live in NY and my Amex starts with 3723 and the input form doesn't recognize it.
As a developer, I understand that there are bugs in software. But if you are selling me a component which can not handle my own card, I would really wonder how comprehensive your card type detection is. They link to this page http://en.wikipedia.org/wiki/List_of_Issuer_Identification_N... which lists 37 as a valid Amex number. I think they need to go through their code and make sure all those numbers are handled correctly.