Although I have an SRT8 Magnum, I recently purchased a 2008 Grand Cherokee Ltd with the 5.7 Hemi for the wife. I am familiar with Diablo Sprots Predator tuner (use it on the Mag), but not the G Force chip for the 5.7. They make some incredible claims, and as dad always said, if it sounds too good to be true, it probably isn't...especially for $69. Anyone have any experience with this unit? Appreciate any input. Thanks.