Proud owner of the S21 from Samsung. This glass protector is a very good product (it comes with 2 in the package). I'm deducting two stars because it was difficult to install (I already broke one glass protector trying to figure out how to do it) and also because after 1.5 months of use, it has a lot of scratches, as someone else mentioned here. They don't bother me, they're not visible when the phone is on. Only when it's closed and under a specific angle of reflection. In the beginning, though, it was amazing. Now I'm looking for another product, but from the same company. Also, this one leaves a lot of fingerprints. A lot. As many as the S7, which I had before and didn't use a glass protector on. But those bother me. I read that there are glass protectors that are anti-oil or something like that. I'll get something like that next time.

Good protection, works fine with the fingerprint sensor (don't forget to remove the plastic film first, otherwise you'll end up with 2 glass protectors on top of each other and the sensor won't work). Good packaging as well. Application instructions in a video on the internet. But it's better to apply it while wearing the phone case. It works fine with a Spigen case (as advertised).

It fits well, does not affect the in-screen fingerprint scanner, but it is extremely sensitive to scratches (it got scratched during application with the same silicone spatula provided by the company!!!) and does not have any kind of oleophobic coating, resulting in immediate smudging and the finger sticking to the screen. Overall, it is a basic simple TPU film (not glass!!!) for scratch protection, with the only motivation being the price (it comes in a pack of 2). I would recommend not wasting your money.

Unfortunately, glass protectors render the ultrasonic fingerprint sensor of the S21 almost useless (tested), so I removed them all and simply enjoy the screen as it should be!