Replaced transmission at 53,000 miles, luckily it was still under warranty. Come on gm your making the imports look better. Got excellent service from Moses gm though. Update on Lucerne: 12-7-16 traded in the Lucerne for a 2012 Honda Accord EX-l V6 and couldn't be happier. No more GM!
My Lucerne (Lucy) is a pretty car and she has never given me trouble. I wanted a white car, and got one used in great condition from a totally reliable dealer here in Tyler, TX. At first I didn't like how Lucy handled, but then, it is a 2009 Lucerne as opposed to my 1994 LeSabre, which I miss to this day. As for as a Buick, I am totally surprised with my choice to get another one but the LeSabre was a good friend to me, and I figured a 2009 would also be my reliable car. I recommend to anyone, get a Buick!
The 2011 seems to have fewer issues than it's previous years, however, I'd suggest you still look at problems reported, such as oil leaks and fuel filter issues. Not a bad car by any means. It's really just a grandpa car. That's all.
The ONLY problem I have with the car is the lane visibility in the drivers side mirror. It creates a "blind" spot that I have never had on any other car. Other than that, I am very pleased with it so far.