I have an 04 SLE and the only problems I have had was the DIC went south, one of the trunk springs broke and the drivers door switch pod switches would not operate the front passenger window. All parts were replaced under warranty. I currently have 35K on the clock.
I keep waiting for the dreaded steering shaft clunk and the window regulator problem but so far no issues.
The paint is holding up with no issues other than rock dings from driving the car.
This is my second Bonneville and if Pontiac brings them back I would buy a third. So far it has been a very reliable car.
Mods so far: Wood Dash Kit-Window Tint-CATZ Fog/Driving Lights Custom Fabricated Stainless Steel Mesh Grill-Painted Calipers-3rd Brake Light Decal-Strut Tower Brace.INTENSE™ Level 1 L36/L26 Performance Package. ZZP ER Rockers and a HV3. L76 springs