I almost returned these because I put them down on my covered porch in early spring when it was still cold they were very wavy and wrinkled. 
I didn’t think that they would ever relax. 
Once the temperatures and humidity started to build -they lay perfectly flat, and they look great. They are a little bit light-( as one review mentioned)-￼but mine are on a covered porch that faces east and doesn’t receive the winds that the back of our house do-I can understand that if they were in the back of the house, they would definitely blow around.
So far I am quite pleased with them and I have had no fading  issues.