I am running a tow tune that I absolutely love. Literally smoother than stock. And between 1.5 & 2 mpg better towing than any programmer that I have ran. And this is with larger tires. Hand calculated. I also have a second tune that is a lot of fun. Jerry.
No issues that would make me want a newer one. Tow an 8500lb tt and have never overheated, even though 8500 isn't a lot. In fact, the more I drive it, the more I love it. Jerry.