IPOD Card Counting

[Squint]

http://www.webtopia.com.au/apps/bjcardcounter.php
Has anyone out there used this application? It seems very straight forward on how to use it. It even has options for different counting systems. It has a stealth mode to turn off the screen (you still have to know where the buttons are though). You can even adjust the number of decks. It would be pretty obvious using this sitting at the table, but if you had a person back counting...I would think this could be advantageous. Any info would be appreciated. I don't post much, but I read the forums often to gain other peoples insight. Thanks.