I have the virtual dyno software on my laptop. Really good little program. Lots of different settings and what-not. I've used it, and I can't say that I don't like it. But, would much rather be on a legitimate mustang dyno with proper calibration and smoothing factors setup correctly by a proffessional and all that jazz but I enjoyed it. Not going to post a snap shot of my dyno graph cos I know I will get flamed, but even with the dyno setup as best as my friend and I coukd, setup to read like a mustang dyno, my numbers weren't too bad. Was really impressed actually given the way my cars setup. Not too many memeber o.n here play with it or tuners, but most of the EVO/dem guys use it and are email tu.ed with it and post up there numbers and are happy. Yea, its not 100% accurate, but its pretty Damn accurate if you ask me and a lot beeter than to tu.e without it if you don't have a dyno tune and or a dyno to measure power on.