My husband bought this when he bought his iPad as he likes to keep things nice and clean and he got it for £1.99 on offer as he bought them at the same time he bought the iPad. I remember questioning at the time what he needed these for as I have always just used a tissue or a square of kitchen roll to clean things like this. I was soon proven wrong however as I tried one on my tablet a few months ago and found that it really did work very well.
This microfiber cloths come in a selophane packet and you can get it online from around £2.50 but you can pay up to £6 so you do need to shop round if you are going to buy one. It measures 175mm x 175mm and is very soft to the touch and it is made to remove dust, stains and fingerprints but as it is so soft it will not scratch any surface. It is washable and can be re-used again and again so should last for ever really unless you use it for something else and it gets marked.
You can use them for anything which has a screen such as mobile phones, tablets, iPads and computer monitors and anything which has a touch screen so they are quite versatile. I find that any fingermarks or smudges completely disappear from my tablet when I use this cloth and it looks almost new it is so shiny and smear free so I will continue to use it.
If you can pick these up for a good price then I think they are most definitely worth it as they do a great job of cleaning any screen and you know that you are not using anything which could scratch the delicate surfaces. These cloths come recommended by me and I give them five out of five stars.