I'm going to keep these (I ordered 3) but I came very close to at least sending 2 back as I didn't want to deal with disassembling the one that was put together. I find it extremely doubtful that each shelf can hold as much as they claim, they are definitely not for "commercial use". 
The main issue is the MDF board example photo is inaccurate. It's not even a quarter inch thick and bends. It might even be thinner than the "OTHERS" example. I was hoping it might have more of a coating on it as well, but I guess you get what you pay for. Fortunately I still think they will meet my needs for what I will store on them, but I wouldn't buy again. I would also suggest getting one of the painted ones. The silver was fine I guess, but I wish it was coated to make it seem a bit higher quality.