Edge Evolution on my 2006 Duramax Chevy
Installation was a snap. Exhaust manifold had already been drilled and tapped by a previous owner so EGT probe installation was trivial. I haven't run enough miles to observe mileage effects, but the engine runs much smoother and quieter than before. The integrated look of the mounting pod is nice. The color matched my gray dashboard very well so no paint matching was required. The Edge Evolution may not provide quite as many bells and whistles as some other programmers but its a very good value for the price.
I have a 2007 yukon xl with 5000mi. and looking for better fuel mileage by adding the edge programmer. In the economy mode I haven't noticed and additional increase in mpg. I also purchased the air intake and the large exhaust. I think my yukon is going to get the same mpg's no matter what accesories are added.