I would never buy one of these cars again, or refer anyone to buy one. I bought the car in March of 2010 with 30k miles on it. It was previously a leased car so I know the maintenance was kept on it. I replaced the tires, brakes, rotors all within a few months of owning the car. Pretty soon I replaced the water pump, tranny cooler lines, intermediate steering shaft, electric steering module, and some oil cooler lines. Just last week I had my car in the service department at my work, and all of my head gaskets needed to be machined and replaced, oil was leaking everywhere!! It was horrible, if I did not have an extended warranty if would have cost me close to $6,000 total for all of the work!
I like the way the coupe and convertible models look, but thats about it.
There are way too many to name. I work for a General Motors dealership and I would never buy another GM car after seeing all the things that go wrong with them in the shop.