These are the real deal. I researched several companies and decided on Indow. Reed Nicholson at Indow helped me through the entire process. I explained to him that the main reason for needing these inserts was neighborhood noise: the barking dog, the loud pickup truck next door, the yard machines, etc. The laser kit arrived and was fun and easy to use. It allowed me to get six measurements per window. After measuring, i decided on just ordering two of the six that i measured (as a test run). The inserts arrived packed wonderfully in a custom crate, with foam and vinyl sticky paper on the glass itself. Each insert was marked, as to which window it was intended. The inserts fit perfectly. The rubber gasket around the outside is flexible enough to allow for "wiggle room" and for ease of installation. I was happy that they fit behind the already installed cell shades (that were an inside mount). Now the test... first off, the sound reduction is incredible. That dog must have left town in that pickup truck, because i don't hear either any longer. And the room is significantly warmer (It's February and we live in PA). You cannot tell that there is anything in the window, because of the quality "plexi" glass. Very nice inserts. Heavy duty. Good weight to them. I have just re-ordered the laser measuring kit, as we plan on measuring most of the other windows. It turns our old windows into triple pane, energy efficient windows, without having to remove, replace (smaller), and deal with all that nonsense. The cost is also not prohibitive. And, you can apply for a tax credit as well (as Indow alerted me). You will not be sorry. These really work. Everything they claim is the real deal. And i'm back for more.