I've had mine 14 months.
You guys ought to come on down here and see our Kentucky roads. They get paved and feel real nice, then you notice a small series of holes. Now, only 6 months later, one of the 3 holes on the Interstate has grown to over a foot in diameter. But that's okay, the blacktop all around it is smooth! I guess they didn't notice the hole when they were paving.
To avoid those 3 holes every day going to work, if I drive to the left I'll be in the other guy's lane, so I have to drive over the fog line to keep my car from being swallowed whole! Ok, ok, so that's a little exaggeration, but you get the point, right? Last year when they were pulling up concrete and replacing it with blacktop I told my boss it wouldn't last but a few years. Boy, was I wrong!
When I drive over rough roads I don't get any unusual noises. We have long and short speed bumps at work. The long ones I go at 15-20, but the short ones bounce the car harder so I go 10 or less. It's the first hit at a steep angle that sends the jolt inside. Once the suspension is going into compression (tire moving up) the ride is great.
I had a really worn out '97 Grand Prix before this. Even with new tires (helped its ride immensely!) it wasn't near as supple over rough roads as the 'Bu is. So, except for a really lousy experience at the dealership and a few minor issues with the car, I have nothing but praise for it overall.
The best part for me is when I'm negotiating the S-curve on the off-ramp on my last leg going to work. It's 3 lanes wide on the bottom of the S and then the right lane splits off at the top of the S. When there's no traffic I cut down across both lanes to the left to "straighten out" the curve and then cut back up into the right lane. I did it this morning and left my foot in it and had a blast! I think the ESC even kicked in to help me. Any other car I've had would have spun out or I would have had to slow down. This one just dug into the corner with the drive wheels and pulled me around, just like it should have. Gonna try that again. Heck, why not? Lots of opportunities!