I wear my tires out to the edges and my bike sees redline frequently. I recently had someone say "Jesus!" when I left them in a corner. I'm not V Rossi, but I don't suck either.
I love my Guhl reflash. To me, there is a world of difference when I whack the throttle open at low rpm, it just LEAPS forward. Low rpm becomes high rpm become redline very quickly. I like it a lot, really transformed the bike. It felt so gutless at 2500 rpm before, now it pulls hard off the corner.
To me, it was a no brainer. Spend a lot of time yanking the flies and spend a lot of money and time on a PCIII or spend nearly the same amount and get very close to the same performance. To each, their own but I am very happy with the result. I have a friend that swears by his 'flies pulled, slip on and O2 sensor installed' bike. He loves projects. Myself, I like to RIDE. We're both happy. I am gonna go do a roll on with him soon and see how it goes. Last time he tried a roll on with me, his ZRex 1200 lost badly to my FZ1, I'm hoping to make it 2 for 2!
I'll do a project if I think it's worth it. I yanked my linked brakes and gave up rear ABS but to me, it totally transformed the bike from a sporting standpoint. It's my bike and my money and time and I do what I think will make me happier. So far so good. If you do something totally different and it makes you happy too, well there ya go, good for you.