I must say that I don´t know what the fuzz is about the works cars. I did say that the Z06 was hard to drive, but I retuned it, and lo an behold, it´s great! I think my main problem was that I didn´t push it hard enough. It really is amazingly quick once you really press on. Other works cars I have, wich are all great to drive, are the 8C, the Supra and the BMW Z4 M with a V10 engine. I haven´t yet tuned all my cars, although they are converted. Two of my cars suffer from the same issues, namely understeer out of corners(!). Probably easy to mend, I just haven´t had the time to do it. Both are American - GT500 and Viper.
I will definitely works convert all cars I can, simply because I can. It´s gonna take some time though, since I tend to buy a new car as soon as I have the funds to buy and convert it immediately. Never had more then 350 000 cr. at any one time... This is partly why I wondered if there was any way of selling your prizecars.