Pluschi Windowsill Seat

Bought three in total. Only one installed so far, and even though it's tightened to the max, the board bends slightly. Plus, the cover and foam smell like vinegar. I'm starting to regret getting them...

Unfortunately, it doesn't stick to any of my 6 windows. I have others (different brand) that hold like a charm. Now it's just lying on the floor. Sadly, only 2 stars because it does look nice.