Very easy to assemble and put together! The bottom two are the sturdiest; the top two wobble a bit but I put quite a bit of downward pressure on the edges jutting out and it seems stable in that regard. No way for the cats to fall off sideways from the top two ledges as well. Love that it folds together easily just in case you need it to. Looks great and modern without looking like it's really cat furniture. I anticipate cleaning the slats off will be easy with just a quick hand vacuum sweep once in a while!