9/10 from what I've seen and read. The only way it could be made better is if they swapped the 'Vette engine for a Viper's V10, to match that maniacally evil grin. Either way, I want one now. Besides, it's called a bloody "Sin" and it looks like that. Paint it matte black with red accents, and you'd have Satan's supercar. Which is hilariously awesome.
Amoritz GT DoniRosset
Here's a similarly obscure supercar (made in Brazil) that is powered by a Viper's 8.4L V10.