Purchased 1st roll from Amazon, liked product so I bought 2 more rolls for a slider door directly from Window Whirl. Unfortunately one of those rolls came with a stain. Thought I could remove it, but I couldn't. Will send pictures if you want to see the stains.
Works perfectly.
It did make difference in blocking the sun in a small arched window that I was unable to get a shade to fit.
Using for rv windows
Was a little hard to put up but easy to cut and it has made a huge difference in the temperature in our room by 10+ degrees.