Hyloft 777 36-Inch X 18-Inch Shelf

I put an entire row of these (or the 15" x 45" versions) along a wall of my garage. All of them went perfectly well until the last rack. When I opened up the box, I realized I was missing both right mounts. I called after hours and left a message for Diamond Storage Concepts. They called me back early the next day and quickly sent 2 new right brackets. The problem was that they changed their 18" brackets and they were no longer usable with the old 18" brackets as they were about 3/4" higher. These new brackets are useless to me with the height difference (already drilled pilot holes and inline row). I called again to explain the issue. The man, who was always nice, didn't even know about the height change in the brackets. I eventually sensed frustration with him, but seriously, who is the one who should be frustrated here? In any case, they eventually found and sent old style brackets that worked.I read other comments on the lag screws breaking off and attributed that to over torqueing them. However, I can attest that even hand tightening them can result in lag screw failure and I'm someone very cognizant of torque. I do believe that the bolts are inferior. It seems to me, although I am not 100% sure, that the bolts for the 36x18 are less robust than the 45x15 version of these racks. I had no issues with the 45x15 versions of the racks. Also note that the new style brackets only have 2 lag bolts instead of 3. I think they should have stuck with the original 3 as that compensates better with the possible bolt issue.Bottom line, these are pretty good racks, but it seems they have some quality control issues. I prefer the 45x15 versions over the 36x18. In either case, with the possible QC issues, you could end up with a good storage rack or something less than ideal. I would still recommend them as they are handy and a good design. Diamond seems to stand behind their products. I would just inspect the products before proceeding with the installation of several of them.