The CV joint boots have failed four (4) times.
The dealer repaired the intake manifold coolant leak at 25,000 miles. This is a known issue.
The dealer replaced the pistons after I complained on three separate occasions about a tapping noise. There was a "silent recall" for this problem.
The tiny lights for the radio controls mounted on the steering wheel failed just after warranty. The dealer wanted $500 to replace them!!
The transmission was replaced with a re-manufactured unit at 3,000 miles. No trouble since then - but the fluid is changed every three years.
Right now, the electronic climate control is acting strange, but I think it's just the air conditioner needs a charge.
The control module for the anti-lock brakes/traction control failed at 87,000 miles. This is another known issue. Dealer estimate was $850 for parts and labor. I bought the part for $200 and had it installed for $100.
I was geting a "Check Engine" light off and on for a year. The code indicated that the EGR valve was bad. I eventually fixed it by simply unplugging all of the wire harness connections at the ECM and then reinserting them. It must have been a speck of corrosion on a connection.
The most aggravating problem is the paint job. It has a metallic blue top coat over a silver base coat. The blue is delaminating in little blister like patches. GM knew about this, but let it go.
The usual parts have been replaced, including front struts, brakes, battery, alternator and water pump. The rear air struts are original, as is the exhaust system.