Anyone ever tried this gauge obd2 setup?

[Turbo900rr]

Or possibly know of something better?
PLX Kiwi Wifi - Connect your iPhone / iPod Touch to your car's OBD2 OBDII Port.
It looks like it would be useful. I want to be able to watch my air fuel ratio and injector duty cycle.

 

[kingnut]

there ones for android phones out there too. alot of people are using them. i havent yet first hand.