It does work "well" it is not perfect, I am 90% happy with it. It does have some issues:
1. Not well known brand, so not sure on long term quality
2. Thicker than regular screen protector, might be an issue with some cases
3. If you have a case that intrudes further into the screen section or one that has a part that goes over the screen, this might cause issues since the pressure from the case on the protector might cause bubbles
The best full coverage protectors that I have purchased in the past come from this place:
https://flolab.io/collections/iphone-8-screen-protector, they make really great protectors and are really highly recommended. They seem to have an additional adhesive around edges to prevent the protector from peeling up.
The reasons that I did not go that route:
1. They take a really long time to ship (~2weeks)
2. They are expensive compared to Amazon knock off version (Manto), plus charge shipping ($4-6)
3. They only provide 1 protector (I always get dust trapped in the first one 😬)
Hope this helps, but I am really happy with the Manto, with the caveats mentioned. If you want a higher quality version, I would go with the Flolab one.