I’ve had it for about 2 weeks now. It’s a noticeable difference. Definitely more responsive especially on the highway. Truck sounds better too now that it’s always in V8...I’ve got a Borla s-type cat back and cold air intake. It doesn’t sound like it’s drowning in water like when DFM would switch on. However, it does amplify the decel popping/crackling due to the aftermarket exhaust. Some people don’t like the popping/crackling so it’s worth noting. Without the range dfm disabler, I hardly noticed the decel popping...idk maybe because DFM was enabled and it was in V4 mode? I drive mostly city...with range I’m at 16mpg, prior I was at 17mpg. Also, idk if it’s a byproduct or it’s secretly built in since they didn’t mention in the description is that auto stop/start is also disabled. The button light is still emitted but the feature is disabled. That was a nice surprise for me since I hate the auto stop/start. I’m not sure about the other stuff they boast about like the longevity of the motor but I’ll take their word for it since it makes sense that the motor doesn’t need to work as hard.