Somewhere between 3-4 stars. Got 3 units. 2 were fine and 1 required filing in order to put it together. So I guess it depends on who machined the parts. The wonky one took hours to put together but the other two were quick. They all seem like sturdy garage shelves though and were worth the sale price. Keep in mind they are narrow and most storage tubs will only fit lengthwise—meaning only one on each shelf. I thought they could hang off the edge a bit and be okay, but the units are too narrow for that. My fault for not double-checking.