My regal is currently at 287k miles, and closing in on 300k fast. This is hands down the most reliable car our family has owned.
Repairs over the last 14 years:
Brake pads/front rotors
Transmission cooler lines x2
Rear motor mount
Turn signal switch
And that's basically it, minus routine oil changes and minor tune ups. All repairs well under $250 and most done by me to save.
The engine is perfect for this car. It's very quiet when you want it, and makes a pretty awesome growl when you drop the pedal. I've been 90 mph down the interstate and held a perfect straight line with plenty of power still on tap
Beefy V6 engine with good mileage
Huge trunk space
Good leg room for back seat passengers
Parts easy to get and are relativley cheap
To be honest, basic maintenace is a tad tricky on this car. I have to jack up and remove the passenger side front wheel to get access to the oil filter for oil changes. The 3 rear spark plugs are a pain to get to as well.
Although I've had no issue with the A/C system yet, it looks like it would be a tad expensive to get it repaired. The compressor is mounted in a very odd place, as well as the A/C lines, and look tricky to service.