Yes! That's the ones I've been using. They are OK. They can actually improve the screen visibility if, like most of us, you have some microscopic scratches on the screen as they will mask those and make the screen look like new. They will not mask bigger scratches and, as Wikiwide says, make sure your screen is clean from dust as any trapped dust particles will cause visible bubbles.

I have been using my current protector for about 6 months now and I think it's about time to start thinking about replacing it. Especially if you use the stylus a lot, the protector can acquire a rather matted effect from the scratches caused by the stylus. But hey, you get a bunch of 6 for £1.50. Replacing one every 6 months will last you three years, probably longer than the phone.