I've had 2 fast (high hp anyway) GP, upgraded all the suspension etc. They still aren't that fun lol.
Handling still sucks and traction is never there when you want it. I'd go from spooling to spinning in about 0.6 seconds. Then spun bearing in 2 seconds :P
I had fun modding my GTP's and did have some fun driving them, but there is a reason why most people move to RWD platforms.