that his are top quality based on posts on this site. As far as thickness, they are both 3/4", and the quality seems to be good on the Zenclosures I've got. My reasons for going with the Zenclosures were primarily esthetic: I simply like the carpeted look and the low-profile design. I knew I wouldn't need huge speakers to satisfy my taste; therefore, I was comfortable with the slightly smaller size of the Zenclosures. IMO they have a more "stock" and "cleaner" look than Chris'. Also, there will be plenty of clearance if I elect to get a cargo cover. GPA