It isn't sexy, it isn't fast. Fuel economy is ok but not great. More importantly, it's very comfortable, reasonably quiet, and spacious. Most eimportantly, it's been reliable and inexpensive to operate.
I've been using my 2009 LT impala for the past 4 years and other than a minor problem where one tire would consistently lose air pressure at a faster rate than the other tires I have not had a single problem. Fixing the tire issue also only took 1 day at the shop at an out cost of around $100. It definitely could be worse. Overall this car has served me extremely well whether I'm going to multi-day roadtrips or just driving in the city to school/work. I can't image what more I could ask for from a hand-me-down and I fully expect to use this car for atleast another 2 years before I look to trade it in for something a little faster and more fun.
Got this car because it was roomy (I'm 6'4") and a solid price - I've owned since new, now have 42xxx miles on it - did have one warranty repair, had to replace the pass. side airbag, but other than that...no issues - the in car computer said I was averaging 26.5 mpg, I thought that was a little high, so I tracked it for a month myself and did the math, and I came up with 26.3, great milage with decent power...look, it doesn't handle the best, but it's not a sports car, it's not the most attractive car, but it's not a caddy - this is just simply good, solid, reliable transportation at a great price - love this car and would buy again in a heartbeat.
I bought this car primarily because I needed a reliable, reasonable efficient and large vehicle. At a discount of more than 20% it has proved thus far to be a bargain. Just put on new tires and brakes (although still had some pad left). Have changed oil and filters regularly, otherwise just drive it and maintain it. Only problems have been minor: ventilation door in dash needed replacement ($70); Dash in front has a crack from Florida sun (not unusual), replacement is about $120; otherwise no problems whatsoever. I also own a Mercedes (with $120 plus oil changes, crazy) and I prefer to drive this vehicle. In overall use it has averages more than 26 mpg, mostly local mileage.
After owning American, Japanese, Swedish and German automobiles, I unexpectedly purchased a 2009 Impala sitting on the dealer's showroom floor. The discount (25%with rebates) was too good to pass up. Included leather, moonroof, Sirrius radio, full power, traction control and 4 wheel disc brakes, remote start, upgraded alloy wheels. After 23,000 miles with only routine maintenance, the car has been great. According to the computer, we have averaged 25 mpg (29-31 on the highway). The trunk is huge and with the rear seat down is like a mid sized wagon. Reasonably smooth and quiet, has not changed since new. Would definitely recommend as a used car, particulary if under power train warranty.