I sure see a power difference but at what cost to items downline :W Been lucky so far on the lowest setting, on the high setting ( 100HP) would surely destroy my tranny. MPG increase just ain't happening with me but it is about the same as stock tune. Not sure what kind of truck your talking about but most Ram guys use Smarty ( Madds) former Ram technicians and programmers at Cummins.
And yes the manufacture can trace your power levels since about 2008 or so and tell if it was tuned or not, if so your warranty would be void.