There was an oil leak. I fixed it myself (somewhat) by changing a few gaskets, and that got most of it. 145,000 miles.
Seats wore down pretty fast.
Serpentine belt slipped while I was driving and I lost power steering and braking.
I was getting 12 mpg at the end of its life! Yes 12!! And I drove very cautiously to try to improve mileage.
Rear struts went out, then the rear spring broke, and a USED spring would cost around $600, so about 1200 to fix it, I said screw it and sold the thing.
The motor was unbelievably reliable. I have a friend with the EXACT same model with 295,000 miles and it runs like a champ. Never replaced the transition either.
Mine took a beating, I hit a deer the day I got it, then I went through an automatic car wash, and it ripped my side mirrors off! But the thing has some awesome power and handles like an awesome boat. It was built like you would expect a GM to be built like.