I just bought the 5-star tuner about a month ago and this weekend was my first trip using it.
The short of it, is I ended up pulling over and resetting the tune back to the stock settings. I thought it was unusable here in Colorado going up and down the mountains. I wasn't able to pull up the passes at all with it programmed. I was somewhat loaded down with the family, water etc and pulling a Jeep YJ but after the 1st big climb, I could tell it wasn't going to work. My foot was to the floor and it just wouldn't down-shift into 1st or 2nd to give me some torque and get up to at least 40mph.
After finally topping out and trying 2 more big pulls, I ended up pulling over and resetting it. I bought it because of the high revving and sudden downshifting but in the mountains here in CO, the torque that the stock settings generate and ultimately keep me at 40-45mph going up Loveland and then Vail passes is better.
However, once down from Vail and out into Western Colorado where it's more flat, I pulled back over and reset the tune back to the custom 5-star tune. I will say, it does work better on the flats. The RPM's seem to be down overall while you're cruising along and also it sure doesn't try to down-shift quickly at the first hint of a hill.
I will keep the tuner for when I'm on the flats and for the gauge read-outs but from my experience, it just won't cut it climbing around here.
2014.5 FR3 25DS for the family!
1989 Wrangler YJ for fun!
29er Mountain bikes for stress relief!
As many RV trips as possible for the lifestyle!