i have some sample in stock since i saw the advert in Electronmic Design magazine... never had any time to mess with since then... by the book, it's suppose to do what you need

Funky enough.. you can find some example on GHI website
http://www.ghielectronics.com/details.php?id=13

I feel USBWiz could be easier to use but ~ 24 USD against ~12 USD for max3421e in single quantity.