Well, admittedly I was a little doubtful about its sturdiness but went with it anyway. Putting it together was a slight challenge, the instructions were not great. 
The best thing we did was dig a trench and set it down into the ground about 4 inches. 
Once completed it was very secure and easily withstood 30-35 mph winds, with 40 mph gusts.
It holds the heat nicely. We were hit with a week of bitter cold, wind, and snow the week after we got it up. I had to use a small heater during the night. It was fine.
All in all, it exceeded expectations. 
tip: In very windy conditions check the nuts and bolts daily, they can loosen.
tip: do not tighten screws all the way, you will have to place and replace them as you go.
tip: the cover was inside out, check it before you put it on.