Two people put this together in one day. Two very smart people with engineering and machinist backgrounds that is. The directions or lack-thereof, leave much head-scratching. Some of the aluminum parts were bent and damaged out of the box, but we were able to repair them on our own. Packing protection would prevent this as the box arrived torn open and there was no packing protection at all. 
The materials the greenhouse are made out of are mostly quality. Extruded, powder-coated aluminum frame and double-walled opaque roof panels are excellent. The lower side walls, front walls and door as well as back wall is made of cheap looking see through plastic material. The temp in the greenhouse today was over 120 degrees on an 84 degree Oregon day. We will look to see if there is a way to order a second roof vent and more of the double-walled, opaque panels to switch out the clear ones.  Over-all a good value greenhouse to help us through this pandemic.  Would recommend it.