I gave it 4 stars because despite careful and unhurried installation, there were some air gaps left (fortunately, very small ones). Most of them disappeared after a second wipe of the entire surface with the dry cloth, but still 2-3 remained on the top side. It's not that it creates a problem in handling or screen performance, it's just that you want the glass to fit perfectly. It's more of an aesthetic issue. Of course, it could have been my mistake.
Regarding the installation:
It includes 2 cloths (1 wet and 1 dry) and 3 adhesive stickers.
This video has simple instructions: https://www.youtube.com/watch?v=PHMFIyOfhgk
Nevertheless, I couldn't achieve a perfect result.

It covers the entire screen, has a hole for the front camera. I easily installed it and it didn't leave any gaps. I had to insist a bit on the corners because there were some bubbles, but they went away relatively easily. It remains to be seen if it will hold up. Anyway, it seems like a pretty good product at a very good price.