I personally have the PC5 and the Autotune. I have used it quite a bit and played with various factors. People are right, it doesn't tune on the fly (which would be awesome), but I do believe it does well. You have to be patient with it and let it make changes as it wants. It can only make small changes at a time, but it definitely does help. My buddy has a 2008 ZX14 and also has the PC5 and Autotune. We have both tried custom maps from tuners on the internet and they are ok, but if you let autotune make changes, you can feel it get better and better. We live in Colorado and my home altitude is 5683 according to my Navigation in my Jeep. I keep hearing various thoughts and opinions and they all vary, but I do like it. My buddy and the 14 race side by side all the time. We test a different map and settings and you can see changes in the hit of the throttle or WOT and at certain parts of the RPM range. We have also found that since we are at high altitude, we can actually have more power with mid grade versus premium. It's amazing how all the variables make a difference. We know a guy that races a ZX-14 on the track and he runs 85 octane with a PCIII. I think each person needs to do what they prefer. But just for fun, I am going to take the Pepsi challenge. I am going to take my bike in for baseline dyno runs as I tune it. And then we are both having them professionally tuned here in town. At that point, I will post the graphs and results.
Kevin