Despite the initial flimsy appearance before construction, this greenhouse really does come together nicely and is quite sturdy. The key is to prepare a level, square foundation and make sure the base of the unit is square before building. I put it together over two days. Would have finished it in one day had it not been for the heatwave. I'm already seeing my basil, pepper, tomato and eggplants enjoying the greenhouse climate without wind and cool nighttime temps. It has held up to 40 mph winds, but haven't experienced anything stronger yet. A few small structural pieces were missing, but customer service answered the phone right away and was quick to deliver the missing parts. Just wish the side panels were also made of the same cellular material as the roof and that the door had a second latch or magnet of some kind to keep it closed at the top, but I'll modify it myself.