ECU Editor on my 08 Busa. I've had a power commander on a 1000, and many of my friends have them. They work well with a good dyno tune. The ecu editor is far superior though, as it basically does everything.
Power commander was an original that set the standard. Many a bike has been tuned well with them. The ecu editor just happens to be alot less well know and only offered for a few bikes as of now. We are just very fortunate to own an awesome bike that this thing was designed around.
The Busa also has 8 injectors, where as the power commander can only control 4. So a good tuner can make your fuel map even better/smoother with ecu editor too.
The ecu editor controls alot of functions that can easily be clicked and changed.
Power commander piggybacks on the ability to upload and use new base and custom fuel maps(and sometimes ignition)and that's it.
Ecu editor allows you to completely control the bike's ecu and basically change whatever you want. You can always put it back to stock settings too. It gives you the ability not just to work on the mechanics of your bike, but to be able to work on all of the computer's settings. Their is a ton of info on the ecu hack forum and the customer service and support from Greg is second to none.
You just need to find a good dyno tuner that is familiar with it. The ecu editor does also have some useful functions that you can easily do at your computer without needing a tune.
It's aslo only $208. This has to be without a doubt, the cheapest most benificial part that you can put on your bike! I can't wait to get the exhaust I want so that I can have mine dynod.