I've always wondered about swaps like this with newer tech. The ATS-V has so many computers in it that all know the dimensions and weights of the car. By modifying the chassis to such an extent, they're going to screw up a lot of the values that the traction control and stability control rely on, and many of those are not editable by external customers, even with a tune. Granted, the car will probably never be driven in a manner that will trigger those systems to act, but if someone were to push it in the corners, I wouldn't want to be riding shotgun.
The old one looked better for the outside. The new one looks like a Ford or an Audi. But the worst thing is that both of them have horrid plastic interiors.