I love the size and it holds a lot more flats then youd think. (Ive got 12 in it at the moment) 
I havent had any issues with the material or zippers. But the zippers are under sized. My only issues so far are the lack of ventilation, and the lack of tie downs inside to the frame. 
As for ventilation your only option is to open the door which lets animals and insects in.
 All in all... its worth the money.