Kits cars like the 240s and Fiero made Ferrari are like Tribute bands in my mind. They're gonna their best to act and look like the original, but the performane will never be the same as the real thing.
There are ones I like however. I like the various Lotus 7 remakes becuase they are more of Euro Hot-Rods than kit cars. Also, some of the Porsche Replicas (i.e. 550 Spyder & 356) are nice as well, due to the fact there are so many shared parts with a VW Bug, its easy to make a car that completely looks and drives like the real thing.