we have two trucks, both 2012, one with the HS one with spartan.
HS: HOT tune
Spartan: 165 Tune
HS: little to no smoke, quieter motor, smoother acceleration, smoother easier shifting, but still firm.
Spartan: Lots of smoke, noisy motor, harsh acceleration, but insane fast, hard shifts, sometimes awkward shifts.
As far as fuel economy goes, the verdict is still out on that.
Honestly, the spartan is a good tuner, and available, I cannot complain, but I would run a lesser HP setting just to be safe, Im honestly afraid of the spartan taking out the engine or trans personally, where the HS im way more comfortable driving it, and I feel like that truck is more "reliable".. Nothing more then that.