One thing to remember, though;
The KPA is only as good as the profile you have loaded. I've found that profiles that work/sound good for one person, don't necessarily work for me. It's very subjective. Then you add different guitars and monitoring into the equation!
Rest assured, the Profiler DEFINITELY has the potential to be the be all and end all for you, but you might need to experiment to find profiles that are a good fit for you. Recently there have been a couple of users on here that have given up prematurely, I feel, but with the right profile you won't need to tweak at all. Try one out in your local music store. It might be that the factory profiles work for you right out of the box, it might be that you need to check out what's on the Rig Exchange, it might be that you need to buy a couple of commercial profiles, but you'll find what you're looking for.
Cheers,
Sam