These are not the first pack of screen protectors I have bought for my iPod, but they mean business. It's good that there are 6, because you rarely get it as you like first time. This comes with 6 microfibre cloths too, which is very useful as after one use they usually get a lot of fluff on. I have just applied it, so can't comment on the durability, but it is easier to wipe off grease than it is off the glass, and it doesn't affect viewing/touch sensitivity at all.
When it comes to applying it, I'd recommend doing it like I read on another review somewhere on here: Wash you hands first, and choose a well lit, well ventilated (so there isn't much dust floating around) place. Before removing the protective film, align the screen protector on your device, then sellotape one side so that it is fixed in the right position. Then clean the screen with the microfibre cloth, taking plenty of time to remove all dust and grease (be patient!), and once it's clean peel off the back film and apply. Leave the front film on until you have removed all bubbles, with a credit card or your fingers, then remove this film carefully so you don't just pull up the whole thing! This did actually work first time for me, with only a tiny bit of fluff, but the rest is perfect!