Hi,
I just completed my soft landing on Oct 6, around 10 pm via Rainbow bridge. I drove from Maryland in my own car (title is not cleared yet) and had no issues as it was listed in GTF. Overall experience was pretty good, it took us an hour to get everything done, mostly we were just waiting for officer to complete the paper work. Apart from COPR and passport, we were only ask for POF and a bank letter with 6 months average balance was sufficient.
As I was visiting a relative for a week, the officer told that the PR cards cannot be send if I am not in the country. Anyway, the COPR is good for entries if we drive next time, it does not work if you fly to Canada and in that case you need travel doc.
The Custom officer just glanced through the GTF list. She showed little concern about the Cars listed in the GTF but was ok in the end. I was also handed over a paper which stated I'll liable for taxes on the value of the car, exempting $10000. I read in other threads that you need to ask for supervisor at the time when you import the car and this can be handled.
Good Luck!!