Broken radiator hose, turn signal flasher.
Other than routine maintenance (1 brake job, replaced rear struts once) the only thing I've had to take this car in for a repair on was a broken radiator hose, which costs hardly anything to fix. The turn signal flasher I replaced myself.
The 3.8 V6 returns great fuel economy. I get 30mpg highway and average 25mpg in mixed driving, which is great for a V6 and better than most other V6 sedans from the 90s. Comfort, economical, reliable, what more can you ask for?
06/09 Update: My Regal is up to 150k miles now. Zero problems since my original review. Mileage, ride, power, all as good as the day I got it in March 06 with 75k on it.
We sold our Buick at 277,000+ miles. Nothing but routine maintenance. These things are solid as a rock.