I have the single Kallax unit that measures 6' x 6' and gives you 25 cubes. It is solid after assembly, plus you need to use the wall brackets that they provide for additional support and safety. Mine is black and up against a wall in the room right behind my system front wall. I find it's aesthetics to be neutral, so you mostly see a wall of records.
One thing, is that the shelves are also open in the back and due to my floor molding, the unit sits out 1.25" from the wall. When putting albums back, this prevented the front edges of the albums from being uniformely flush. This bugged me, so I got five 6' lengths of 1/4" allthread, drilled holes, and ran it horizontally through the backside of the cubes as record stops.
Kenny
One thing, is that the shelves are also open in the back and due to my floor molding, the unit sits out 1.25" from the wall. When putting albums back, this prevented the front edges of the albums from being uniformely flush. This bugged me, so I got five 6' lengths of 1/4" allthread, drilled holes, and ran it horizontally through the backside of the cubes as record stops.
Kenny