I have the BNR tune and when I purchased it I specifically asked for him to make it hold 5th gear when I'm towing. I tow 2 side by sides on a utility trailer pretty often, usually on the same route. Its between 3500-4000 lbs total and before I was getting around 13 mpg. After the tune I'm getting 15 mpg. This is running right at 70 mph on fairly flat ground. Not sure exactly what the rpms are running at. I think I could do better if I baby it a little more. All around the tune made a nice difference.
I ran the Diablo generic tune for a few weeks while BNR built my tune and I noticed a nice difference from stock with it. However my transmission did not like the generic Diablo settings. It would shift really hard into 6th gear and the lag when accelerating at around 30 mph was worse than stock. When I loaded the BNR tune I immediately got better shifting, smoother acceleration and felt like it had more power. The only thing some people that are looking for more speed might not like with the way it's set up now, to hold the gear longer, is that it doesn't downshift quite as fast as it did stock. I'm very happy with the BNR tune though.