I use it, it is a great system, sell that PMS while it is still worth something, the value of them seems to be dropping quickly. The guys i bought it from were big PMS supporters, and said switching from the PMS to the holley, they saw a huge difference in how their race car drove thru the pits the first time out. I used megasquirt2 before the holley, and there is no comparisonon. Better user interface, easier to tune, and the self learning on the holley is amazing.