Like Ulysses said, it doesn't have a "Wow" factor like the previous versions had. The previous GTS version created a huge buzz at the car shows, with people gushing over its agressive looks and meanacing stance.
I couldn't imagine paying $95,000 for this thing ($85k plus taxes, tag, title, extra warranty), and not have the "head turner" looks, and know that the new bone stock Chevy Z06 down the street is quicker and lighter for about $20k less.
It doesn't make sense for them not to increase the HP, which would be so easy with a different exhaust and intake, easily netting out to about 550 hp and pushing performance past the Z06.
Just my 2 cents.