My wife and I bought a new 2014 Impala 2LTZ (3.6 V-6). It now has 107,xxx miles on it.
The car has been used for work commuting by my wife, and pleasure driving by us. We have taken it on several vacation trips, driving no more than 400 miles. It is a very quiet, comfortable and well-driving vehicle. We still get compliments from others on the styling. The 3.6 V-6 engine is VERY smooth and powerful for our needs. I would stay away from the 4-cylinder in the Impala.
When new, there were several software issues that had to be repaired / updated under the new-car warranty. The car has held-up very well, other that transmission issues which were repaired under my GMPP (zero deductible).
The transmission cooling lines began to weep (not leak badly) where the rubber meets the metal connectors. The lines (called pipes) were replaced as an assembly by the dealer, with the cost being about $350 retail (but paid by GMPP).
The transmission would shudder at times, and pause on the upshift from 2nd to 3rd, when accelerating normally from a stop. The transmission was repaired by the dealer under the direction of this TSB:
18-NA-358 1..2 Note that this TSB has instructions to the dealer on how to repair the vehicle, and is not an extended warranty. The retail cost would have been $1,5xx about 1-2 years ago (but paid by GMPP). (EDIT: The cost in 4/2023 was $2,361).
At 104,xxx miles, I replaced the two original headlamp assemblies with OEM GM units. The LTZ model has high intensity discharge headlamps. My cost was $806 per assembly (which was 10% over dealer cost). The lamp's lens were fogging and getting cloudy.
Recently my wife became antsy as the vehicle reached 100,000 miles fearing a breakdown. She wanted to buy a new car and bought a new 2025 Chevrolet Equinox RS AWD. She is disappointed with the vehicle and its maddening controls and poorly designed dash. She has continued to drive the Impala, and only drives the Equinox in poor weather (AWD).
If GM still made the Impala, we would have bought another one without hesitating. We buy new vehicles, partially due to the warranty and GMPP availability.
I have read on this forum about a/c evaporator leaks on several model year 9th generation Impala's. GM issued an extended warranty / satisfaction campaign to repair those with leaking evaporators. You may want to do an internet search? The a/c on our Impala (a/c never serviced) is still very cold and works flawlessly.
Good luck on your decision. The 9th generation Impala is a rock-solid sedan and I am surprised the GM discontinued the model.