So far I have used my large cover just in my backyard. I have been quite pleased with its performance, keeping temperatures from climbing much above ambient, and shielding from dust and pollens.
It's a well-made cover. There are two layers, the outer one reflective, and the inner one semi-transparent. Both are made of heavy-duty plastic sheet that seem quite durable, and so far, have resisted snagging and tearing on less-than-blunt corners. It has survived some moderate winds without visible damage. I would recommend it if you need to leave your gear set up during daylight hours.