I got an intune i3 platinum and went with the stock 93 tune. It improved things but I still had to get a pedal box so I wasn't flooring it all the time to get moving.
Then a nice fellow recommended I contact diablewtuning.com. I did. Since I had the i3 platinum, he could help me out. So I did a data log and sent that to him. He sent me back a custom tune. Holy crap! I had to pull the pedal box because I kept squealing the tires. This thing is now performing as I would have expected vs. being a giant, 2 ton pig. I'm only 90 miles into this diablew tune. Once I hit 150 miles, he wants me to do another data log during a WOT acceleration run. Then he tweaks it and sends it back. If it gets any better, I will be really happy.
The reason I wanted a tune was for towing my 10,000 lbs fifth wheel. It's snowing here, so won't be able to pull it for a while.
Unfortunately, he doesn't do custom tunes for other brand tuners. But if anyone is in the market for a great custom tune for their 6.0, I would highly recommend going the diablew route. Major improvement.