Mademoiselle! I just bought the large JM last month in beige and I love it. It holds the shape better but I haven't seen the timeless tote in person. Plus its more discrete and doesn't have the big CC logo. The price difference is significant though if thats not an issue.
I agree. its difficult to open the bag because the chains slide through, however, if you use the rings (suggested by another TPfer) it helps the chains from sliding through.