Review on Barucci Car Side Window Sunshades - 2 Pack: Ultimate UV Ray Protection for Baby, Kids, Pets & Passengers. Stay Cool & Safe with Easy Installation! by Robert Norris

The suction cups were a little difficult to attach to the blinds and then attaching the whole thing to my window was difficult (mainly because my window was sloping). They are of good quality and fit well. The suction cups aren't very good BUT if you soak some saliva (roughly, sure, but effectively) on the suction cups themselves (water will probably work too, but you need to make sure they're covered) and then apply pressure and hold them less than 30 seconds firmly in place, you should have no problems. Mine sat for about a week and they didn't move, fall or come off at all. The only caveat I want to make is installing it upside down. So the weight is lighter and it will likely stay in place much longer as long as you don't lower the window a lot. I rarely do this because the only passenger I have regularly is my dog and I bought this for her. All in all a good product and I am satisfied.