I overall am happy with this car. I agree it is not a trouble free car, but at my financial level it is acceptable. I have driven the car across the country and it was excellent, never let me down.
All of the problems with the car have been an easy fix, and it was stuff I could do myself in the driveway.
The transmission was replaced under warranty 10,000 miles ago, and I experienced none of the problems that have been stated in other reviews.
The leak is more of a dealer install fault, and was corrected easily with some thread goop the dealer gave me.
The car has great pull, and does fairly well in the handling area. I put on some wider rims and better tires, and although it decreased the ride quality, it vastly improved handling and tire wear.
The engine is extremely smooth, and compared to the old 3.1, it's a great improvement.
I do not have the cylinder deactivation, and will never get a car with that junk, I have never seen it work right on any car of any manufacturer.
I will be happy to keep the car, and probably sell it at 100,000.
Here is a tip for all Impala owners. The cradle bolts may need to be torqued eventually (120ft lbs back, 118ft lbs front). Doing this makes a huge improvement in every aspect of your car's ride and handling, and it eliminates the "clunk" that some may be hearing when you accelerate. This is not the only car I have had to do this to, as it was an issue with my Focus too.
Overall I like the car. Would not pay the 25 to 30 for the car, but it was a good buy at $7,000 used.