I ditched the Superchips and have a 5 Star tune on the way.
The Superchips tune was okay, my rig didn't like one of the tunes that it came with and would misfire. The 87 economy tune seemed to perform the best but never saw any mileage gains. My biggest issue was when i returned it to stock, my truck didn't seem to run real well anymore. It's almost as if the restore messed up some mapping in my stock tune. The Superchips customer service seemed uninterested in offering any help. I wouldn't recommend them on that alone.
I already have my SCT x4 and have installed their pre-loaded tune and am already impressed. Eager to see what the 5 Star Tunes will do for me. I'm getting an 87 Economy, 87 Perf/Tow, 87 Perf Only, and a 91 Perf/tow.