No real down side to the Porsche AWD. Recent R&T said the only car to marginally beat the Porsche Turbo around the track was the 458 Ferrari and it wasn't by much. The Porsche won in a straight line. I own a '11 Turbo "S" and a '11 ZR1. Totally different feel in each car but I wouldn't be too quick to find any fault with either car as far as performance goes. The Porsche PDK transmission is the best I've ever experienced. The shifts are flawlessly fast and intuitive, up and down. It's like the car knows what you want. The ZR1 is a beast but can't get off the line. Once you get traction your gone and AWD would be one solution to the traction issue. It's not likely we'll ever see it in the near future because of costs. The Porsche is 50K more and of course you get plenty for the money including great seats, but will people pay for it in a Chevy? I don't think so and I don't think Corvette needs it. Other than drag racing, which usually is from a roll on the street now a days who needs it?