Driver's window squeaked and the steering column needed regreased. Both fixed under warranty.
We have put 18,000 miles on this car and it has been very reliable. We get 28-30 mpg on the highway. We are very pleased with the Impala.
I found a TSB (technical service bulletin) on the 2006 Impala. It seems a production of the chrome belt line weather strip (the outside horizontal piece at the bottom of the window opening) can scratch the outside of the window. My dealer offered to replace mine outside of my 36k warranty.