The only shortcoming, and therefore only four instead of five stars: The disc is not multilayer anti-reflective coating. The advertising "6x multicoated" suggests a highly effective anti-reflective coating for photographers, but in reality are so coatings meant to protect against scratches and breakage.
Nevertheless, the disc is not more or less than clear film reflects, distorts less and can be very easily (and in particular without bubbles) apply.
