Of course Barth was a 20th century master. You can read all the other reviews to get that. But I question the majority view that this is a great binding. It's fine, but nothing special. Obviously glued, not sewn, so it probably won't stand up to heavy use.
I'm not upset about this; it's a nearly 10,000 pages of reading for under $200! Quite a bargain, but don't expect archival quality.