Bonneville'* interior is very good. Its not as conservatively styled as many other cars, but its designed for a performance look and feel. The ony area I find that it falls short on in my 2000 SSEi vs my '93 SSE is the supportiveness of the seats in hard cornering. The '00 is certainly comfortable, but there isn't much keeping you centered in the seat. Side bolsters were better in the earlier models.
As for the issue of plastic, and the magazines like car and driver and road and track, I think the Japanese auto industry has their writers brainwashed. I sat in my sister in law'* toyota solara not long ago, and didn't see anything remarkable about the "quality of the plastic". That'* rubbish.
I went for a ride in my buddy'* BMW 540 this past Augst. Nice car, but again, I come away thinking that the people who wright all the gushing reviews of the BMW did so because they're hoping to get a long term loaner from the factory. I've got 12-way power seats on BOTH sides in front. His passenger side seat had manual adjustments. I went to lower the seat and nearly clipped my daughter'* toes off in the back seat when it simply slammed to the floor when I moved the lever. There'* no way for someone my size to raise it either, until you're out of the car. It simply had no dampener, or spring assist or anything.
As for comparing Chevy to Ford to Buik to Pontiac, I think its all on par as to quality. Just style is a matter of taste.
2000 SSEi; Silver, Grey interior
K&N filter, removed MAF Screen, TOG Headers, 3.4 Pulley, MSD Coils, Taylor wires, 180 Thermo, Pirelli P-Zero M&* tires, J.A.T.O. Booster in trunk