Very impressed with our Indow inserts. Faced with new families of screaming kids at the pool, and not wanting to spend 10k on new windows (or more)... and we just had them tinted too... the inserts were a great option for us. We have about 10 windows facing the pool and did the downstairs as a trial. Results are in, they work and work well. The fit? wow. that was the impressive part. Using their tool kit, we measured, ordered, and got the inserts in about 10 days or so. Everything fit like a glove, the customer reps were very responsive with questions (engineers ask a lot of questions). We got acoustic grade and had no problems with fit behind our set-in blinds. Added bonus: Hurricane resistance. Irma messed our area up and flying tiles took out a lot of windows allowing weather inside. This will add a bonus layer, of 1/4" material behind the window. The sound is heavily ...heavily dampened with no added echo. Of course we can hear some noise, but at such a decreased (less sharp) level. That ear piercing is gone and we have peace again. Thanks Indow! credit where credit is due and you guys did a great job. Very pleased.