I've never driven a Viper. I like the way they look (on the outside, at least) and I think I would enjoy the gobs of power. However, I've heard criticisms before about the interior and also heard that, unless your thrashing the shit out of the car, it's kind of a pain in the ass to drive (i.e., not all that comfortable, etc).
P.S. Vipers are those cars that everyone thinks are the fastest things in the universe simply because they are Vipers. A completely stock Viper could be sitting next to a top-fuel dragster in Kroger's parking lot, and some 15 year old kid will walk up and proclaim that the Viper would destroy the dragster simply because, well, it's a Viper, which are incapable of losing a race of any kind.