Well, if we're talking street bike that doesn't have any issues to begin with, what's the point of the PC at all then? Looking at the gains the newest 600s are getting with an aftermarket pipe and PCIII map, they're only gaining 1 or 2 hp. Again, I don't see the point.
I went with a PCIII and map for my Tuono because I made a drastic exhaust change (Akra full 2-2 system from the stock 2-1). Even though the system came with a chip, the chip is actually designed for a Mille and thus was not ideal for the Tuono. Almost too rich... Plus, the map ended up getting me a 10% peak change in torque and 9% in hp.
IMHO, a PCIII for a street bike is to merely get better air/fuel ratio and make the bike run as well as possible. Every bike produced today has more than enough power for the street from the factory.