I have been at this hobby for about 5 years and initially ordered material from a few different suppliers to try them out. About half of my medium supers ( I run all mediums including 3 for the brood chamber) are the traditional box joint and half are the rabbet joint from Brushy mountain. Witout a doubt in my mind the rabbet joined supers are holding up much better. The box joint corners are all peeling paint and the rabbet joined are not. Once the paint started to peel and all that end grain exposed on the box joints the peeling really speeded up. I believe in the years to come the rabbet joint supers will outlast the box joints by several years. And by the way, although the tree medium brood chambers are about equal in volume to two deeps I think I'll be overwintering in 4 mediums from now on - this warm winter in new England has seen the usuall winter stores go too quickly. Timsul