Shelf metal is sharp. Corners are very sharp. Can get hurt assembling. 
The metal is not super strong---one of my bars warped during installation. 
Everything is hammered all the way in, yet mine doesn't sit flat. I'll have to put a piece of felt or something under one of the feet. But really annoying that it's rocking a bit. 
The shelf boring themselves are thin and very sad/cheap looking. But... This is an inexpensive product. So you get what you pay for. 
I really do not like how my one bar didn't fit quite right and warped. I'm concerned that that shelf won't be secure.