Honestly? It’s pretty flimsy, but it gets the job done. There are screw-in bottoms in an effort to stabilize it, and you have to lift it from the bottom to move it, but it’s light, a great size, and versatile. 
Side note, the first one sent to me had the incorrect pieces. Way fair sent me another one ASAP for free, and I was able to keep both. Now I have a three shelf AND a five shelf!