I've been using Livernois tunes since 2012 (first on my 2011 EB, and now on my 2013, which replaced the 2011).
After dong multiple camping trips this Summer to various places, I got to know my 91 Tow Tune quite well. The tune was great, but my biggest complaint was the lack of throttle response off the line during partial throttle starts. I contacted Anthony at Livernois and explained my issue. He promptly acknowledged my correspondence and informed me that his tuner would work on a revision.
About a week later, I received a new revision for my 91 Tow Tune. Wow!! Throttle response is greatly improved - night & day. Now when I do a partial throttle start, I no longer have the lag followed by a surge of boost. The throttle response is instant, predictable and linear. The truck is always in the right gear for the given situation (hill grade, speed, etc.), just like before. The truck also feels stronger throughout the power band (I can't confirm any dyno nos., but it feels like it picked up another 20-25 ft/lbs of torque).
I tow a 30' TT, and constantly haul stuff in my truck bed, so the Tow Tune is the one I have to use the most. I highly recommend this revision to anyone who frequently tows or hauls loads. Livernois hit a home run on this one.