I was impressed at how well I like this greenhouse.  It is sturdy, my plants love it, it was extremely easy to put together by myself, and, over the weekend, we had a bad storm.  Gusts of wind over 45 MPH and the greenhouse had no damage and had stayed where I had put it.  The plastic is heavy and the zippers work great.  I used the tie downs to secure it to the frame as the instructions stated.  Very happy with purchase.  Would buy again.  Price is excellent for the product.  Update, added photos, and my strawberry plants are blooming in the middle of winter!  I weeded yesterday and I was quite surprised at how much hotter it was inside the tents, I love these things!