IMO all of RM's linings have been very qualitative. She has two types of floral lining, there is a cotton one, which isn't very thick, but does hold up well. There is also a black/white floral canvas lining, which is thicker and heavier. So far we haven't had issues with any of her linings. The only one a few people had issues with were the blue/white stripe. It wasn't the quality of fabric though, it was the dye that caused the lining to bleed on *some* bags. All of the fabrics she uses for her linings have been very qualitative.
RE the feet-- not all the signature feet were defective. There are many of us that have had multiple bags in signature hardware without any issues. I honestly don't think the feet are defective, i don't think the factories were attaching them on all bags the way they should have been... but anyways, seems like the newer feet are holding up better. Haven't seen any feet issues posted here with the newer line.