What year model do you have? PC III is a crude piggyback method to alter fuel injector duration but does nothing to help with other tuning variables. The pre-Euro3 bikes respond pretty well to the PC III.
Euro3 bikes use an o2 sensor and you have to deal with that. The PC V may work, but you will be better off all around to get a tunable ECU that can address ignition timing and other variables.....of course, that's a bit more money.
Not sure any PowerCommander product will work on the newer Eldor ECUs in the current generation bikes.
I cant really comment. The latest mv map is different to my base map the power commander is built on top of. I am one or two out of date.
The dyno operator noted my stock map was quite rich and he only had to adjust by small percentages, eg 3-5% (r6's and such get adjusted in places in excess of 10%).
If the current maps are similar you'll find fitting a slip on the bike copes without adjustment. You just maximise whats available by fitting a power commander or similar and will probably find the extra investment not worth it.
If you go full system and air filter then thats a different story.
Would be great to hear from others who have fitted these 'slip on' type systems and how they find the ride afterwards.