I used use glue when putting together just to strengthen the units. Easy to put together, though time consuming when you have 21 units. They look great though and give the closets that nice,, classy, completed look. A few hardware pieces were missing, so I was glad I had extra bags to pull from. Overall ended up just missing 1 small (drawer) lock cam. Drawers slide in and out easy with a nice sound. Hoping they last the abuse of short-term renters. Good value for the money though.