For the price, this is a good product. 

It took my partner 20 mins to put this together. We timed it. Less time for the second one. 

Tip to fit the little suction cups into the metal tabs that hold the glass in place, put a touch of clear dish soap on the part of the suction cup that has to squeeze through the hole in the metal tab. This was a huge timesaver. 

The glass is high quality tempered. 
The shelf itself is fairly sturdy once the shelves are all on. There are a few connections that aren’t perfectly in line, but it’s forgivable and not really noticeable (we just put that part against the wall).