Working well, but a little inconvenient
I am pleased with the sound effectiveness of the isole sound barrier sheet, in combination with the door sealing kit that came with it. The value for the price is good, and the product appears as advertised. I chose white/snow, which is neutral enough to match. It has made my home office enough soundproof against conversations elsewhere in the house that I can concentrate better! I encountered a few obstacles to installation and daily usage that are still workable but not ideal.
First, the sheet was not quite long enough for my doorway. . . though I measured and it seemed to be "standard" I wasn't expecting how much space it needed at the top for the mounting bolts. My solution was to install and trim-paint a piece of 2x3 across the top of the doorway, and install the bolts into that instead - a complication in the install but not insurmountable.
Second, because of the nature of the product, the finished side is to be installed facing the sound (in my case towards the hallway/living room where other occupants of my house mostly forget their "indoor voices"). This means, since my door swings into the office, that it is mounted at the hallway entrance, and I must squeeze through it when I enter & exit. I installed some loops at the bottom so that I can hang it up on the mounting hooks when I am not working, but since it still hangs down halfway, I'm ducking under to enter. Also, the thick heavy material which effectively blocks sound also blocks air circulation so it gets pretty stuffy in my office. There, too, workable but way less convenient than if I'd been able to mount it to open with the door itself so the air and I could enter more easily when it isn't noisy outside. . . on the other hand, it certainly blocks the sound better this way.
Third, though the "snow" side presents well, since I'm constantly moving through it on my work-at-home days, there is now a "pick" on the backside fabric that doesn't look great from the inside, which is what shows when I hang it up to get it partially out of the way. Offering an option to have the sheet finished with the same fabric on both sides would help this!
Fourth, only applicable to the sealing kit, I was not able to use the door sweep, because it is very thick, and to install it on the "side with the sound" means the door can't close, and also there is a carpet-wood transition threshold that further limits installing anything at the bottom of the door.
Summary: I'm glad I bought this, and I do recommend it for noise suppression, but could recommend more highly if it had been easier to install and navigate around for use cases like mine.