Well, like Gregg said, both are awesome units, and especially with this bike, will basically do exactly the same thing. I'm a Bazzaz guy, I've used the Bazzaz for my past 4 race bikes because it offered more for your money for the CBR1000 and R6. I prefer the Bazzaz interface, I prefer the Bazzaz autotuner which allows you to review and edit changes before making them (Power Commander just makes them for you, you don't get input on the changes until after they are done), and the Bazzaz costs less in every situation. The basic Z-Fi is less than the PC-V, the stand-alone quickshifter is less than all the required Dynojet parts, and the Z-Fi TC is less than the Power Commander V with quickshifter plus the Bazzaz has traction control which the Power Commander doesn't offer. There are top race teams using both, as well as other electronic packages. A lot of people have used Dynojet for a long time and swear by it, but it's a no brainer for me to go with Bazzaz.