GM has always struggled w/ quality control and a normal product development cycle, usually only getting a vehicle model "right" from the engineering perspective after hard years of dealing with consumer complaints and production line changes...then, instead of selling the product to happy consumers for 3 years while designing the next generation, they typically stop production!
So, you end up with a sizeable group of dissatisfied Chevy owners plus the happy ones who feel like thier fine choice of car was tossed out the window by GM upper management! (for example, think Fiero; GM actually built a nice 2-seater for the masses after struggling through initial years of terrible driveline problems, only to axe it w/ no follow on).
The proof is that GM went from historically holding the majority of U.S. market share in both cars and trucks to closing more plants and laying off more workers than any other time in its history.
BTW, when I mean shaking loose, I'm talking improper assembly of interior and exterior pieces, and finding those flat black screws (used for putting together the forward part of the cabin) of all sizes in the footwells on a frequent basis, wondering where they came from. The whole car started "sounding cheap". My last ride in it was just a short 1-mile hop, not above 25mph, and the left rear fender sounded like it had broken loose from one of the bonding strips used to affix it to the chassis, developing a weird pattern of stress cracks in the fibreglass. Then, he had some strange oil consumption problems after breaking in the motor, sometimes using up over 2qts/1,000 miles on a highway road trip, only to have it not burn any oil between changes, and then do it again. You don't expect this from a car with that sticker price. The sad part is, the Bowling Green plant is THE best production line GM has in terms of QA.
I do agree, when set to soft, the ZO6 ride is commendable...much, much better than my old Stingray, and amazing that by switching modes you can change it instantly...there's no sound of small electric motors moving anything on the shocks; it's instant. Not sure how they engineered this; it's like turning a light bulb on or off.
v/r, N-A