the greenhouse is OK for the price paid. It's not the most solid construction. If you have heavy plants, do not plan on putting them on the shelves, as these are made of light wire, and will not withstand the weight. 
The door does roll up, but if you leave it up and tied, and it rains, the water accumulates into it and makes it heavy, and it ends up tearing at the junction. So be mindful of this. Overall, the greenhouse does serve the purpose, but you probably want a stronger rope to tighten it and fix it to the ground if you live in a high wind area like I do.