Kathleen Kleitke 3 The stick that holds the frame on the window side broke within three weeks of use, with only on cat's normal weight. Since the product is not able to promise durability even under the promoted weight limit, the overall score is low.The suctions work great, once you screw them tight really well! That is an absolute plus and the reason to make this investment as supposed to cheaper products.Since the frame is broken, I think that the material of the mat will soon rip because of this, but the structure still holds more or less well. My cat absolutely loves it still. We'll se how long it is usable.