I have had the Edge EZ on my truck for almost 18 months. I have towed my 12k 5th wheel across Missouri, Kansas, and into the Rockies of Colorado with the power level set on level 1 and also level 2. I bought the EZ just for the enhanced power while towing and have been very pleased. With the EZ I have been able to tow up many inclines without downshifting from overdrive, which previously required a downshift. As Roy W said, however, you definitely do want to get a pyro gauge so you can monitor your EGT. Even though the EZ will enable me to pull some inclines without downshifting, I still do so sometimes in order to keep the EGT temps below 1300. Installing and removing the EZ is very easy and quick. I have had no problems with mine and would recommend it.