I'll try to put it into perspective from my own experience.
I own a '98 ZR 600. I put LOTS of money into it, making it just how I wanted it. Custom bars/riser, D&D performance mods, SnoPro suspension, etc. At the end of the day, it still had it's flaws.
Two years ago, I decided it was time for an upgrade. I ended up with my '06 SnoPro 440/700 conversion. The first real ride I had on it, it straight up kicked my ass. The suspension was still setup for Sno-X, and stiff as hell. I was so sore the next day, I could hardly walk...and that is not exaggerated at all. I rode it all season, then hopped on my ZR to make sure it ran ok. I rode it no more than 5 miles, and could not stand to ride it any longer. It felt like I was riding a bulky, outdated tank. The running boards are so narrow, the tunnel seems very wide, and not being over the center of gravity is very awkward. I have ridden my ZR no more than 10 miles in the 2 years I have owned my SnoPro.
As most people will tell you, once you go rider forward, you will not go back. The transition from standing to sitting is so much smoother. To get a rider forward from Cat, you will have have to get a '04+ SnoPro chassis.