Just as is true with many things in life, there is more than one way to get from where you are to where you want to be. If you are happy with a simple fuel adding black box "tuner", so be it. If you are happy with a slightly more capable add-on device like a Power Commander, so be it. It's your bike and you can do whatever you want. BUT, if you ask for advice about what the BEST approach is, anyone who is really knowledgeable about the latest closed loop EFI is going to tell you to use a solution that retains the closed loop function. It just so happens that of the current choices, many of us believe the TTS MasterTune package is the most capable of those solutions. If you don't like that advice, feel free to ignore it.
btw, I have an older bike without closed loop EFI, and I've still got a PCIII on it. Haven't had any problems with it once I sealed the connector to keep water out, and it is adequate for what I do with this bike. If I ever get crazy enough to buy a new bike, however, it will get the TTS package unless something better comes along by that time.
FWIW - Jerry