It appears to be good for keeping my plants safe through winter frost...however, as stated in several other reviews, it is indeed a pain to put together.  I thought when I read the other reviews, "how hard can it be"...well  needless to say you need to follow the instructions to the letter, and watch for the little things, boy what a job.  My hats off to those who don't have any problem...I wasn't one of them.  It should be anchored however, it is rather light in weight and if you have big winds in your area, I can see it catching air!!!  Over all it will keep my delicate garden flowers from frost which is why I purchased it.