The product itself is fine. They are pretty flimsy but keep out the draft. I’m not sure why the corners of the indows need to be deliberately damaged in order to fit in place. It seems like bad design and the first area where the inserts might begin to break or show wear and tear. Salesman Jeffery and fit specialist Daniel were evasive, aloof, and uppity. We had an issue with a window that we ultimately had to cancel an insert for and after multiple emails to both Jeffery and Daniel, to which they never responded, we had to call them multiple times to get our order fulfilled. They also claimed we hadn’t returned the Indow Fit Kit, which we had promptly after receiving it. I’d like to purchase more Indows for my home but I wouldn’t want to deal with these two Individuals again. That being said, our Indows were shipped in a very high quality crate and arrived undamaged.