Myself and a buddy purchased several tuners each and Both tested them at the local track extensively on both our 10' Hemi Rams.
Bully Dog GT, Superchips Cortex and Diablosport's Trinity. ...only one that got me into the 13's was the Diablo Trinity
They are also the only Tuners (Predator/Trinity) than allow custom CMR tuning for a Hemi with major performance mods like Heads/Headers and Cam's etc.
I'm not quite there yet...but will be soon.