Having owned a '66 Big Block Corvette Convertible for 25 years, the GS in my opinion is one ugly mutt. There are other companies making GS replicas, but I'm sure SPF will become dominant given their history. I would speculate sales will be slow even in a good economic climate. Just look at those flares.
They would sell more repro Vettes, if they reproduced the 1967 435HP Convertible, though it does seem like every 1967 Corvette owner has one already.