I dont have a GP, but I will agree that my W-body doesnt seem to built nearly as solid as my Bonneville, it has more rattles and squeaks, and just has a cheaper feel to the whole car.

I abuse the suspension of pretty much anything, because I drive down about 15 miles of gravel road round trip on an average day, and that takes its toll no matter what you drive, but the Bonneville seemed to hold up to anything and everything much better.

Ive never really noticed it to have a rough ride, I will say that the seats pale in comparison to even the seats on the SE i had, they are much less comfortable....i suppose to instill a "sporty" feeling....but id much rather have a comfy seat myself.

handling-wise they seem about the same to me really, the Intrigue has moments where it seems to handle better, and some where it seems worse....i cant explain that, probably driver related