I got mine installed and put 300 miles on it over the weekend. wow how sweet that is, holy cow! I found it to be both 'unobtrusive' and 'powerful' my truck is totally stock at the moment and I was very impressed with driveability. you dont really know the box is there unless you get on it. then watch out.
I didn't really put it through the paces because I am gauge-less at the moment. But I wanted to test driveability and fuel economy. over the 300 miles I detected no change in mpg, over the same run over the blue mountains. I get about 17. 3 over that run, empty running 65.
The other thing I noticed was that the cruise control is even more solid than before. holy cow, the spedo doens't move at all.
Also: any of you out there heasitate to touch that ECM connector? oh my goodness that is an easy install. the connector itself is anything but fragile or tempermental. mechanically it is very solid, very easy to remove. its a total breeze. hats off VA, you did a good job.
So first impressions; this is an excelent driving box. smooth, unobtrusive power. I can't wait to work it.
next step is to test stacked with the VA level 1 (pressure box).