"REV" Looks to me like the coolest thing on the planet!

Before I spend another $50 on something useless I want to know if any of you are using it?

REV:"Rev is an application for the iPhone and iPod Touch that monitors, displays, and records real-time vehicle data. By communicating directly with your vehicle's ECU via its OBD-II port, Rev is the first iPhone and iPod touch application to give you complete access to everything you want to know about your vehicle."

http://www.devtoaster.com/products/rev/

 

Some are using LogWorks

 

Logworks doesnt look any better for $179

The Rev one is 50 bucks

Have you used it yet?