I too would agree that they are the best.
I did have a problem with the cover made for my Plymouth. It used NOS material...so it was costly. (This is over 10 years ago)
I found some light stains on the material. After sending them pictures, they suggested I show them the car at Carlisle. I did. They suggested using a cleaner on the material and suggested a particular product. I couldn't find it, even calling upholstery shops..you name it. I did try some other products that did not remove the stains.
It must've taken a year to get it replaced with what seemed like endless phone calls.
So..I too would recommend working with a dealer than may have some clout.