Considering 1 pack of these is £4 in my local supermarket, 6 packs for under £10 is pretty damn good. Of course I'm not entirely sure when I'm going to use them all and have been offering my friends and family a complimentary "glass wipe" when I see them, which has garnered me a few strange looks.
They're very moist, on a few occasions I've had to wipe my glasses off with some tissue afterwards which sort of defeats the point, but that's the only downside and not all of them are too wet.
On the plus side, excellent value for money, they do a really good job cleaning, they don't smear and they are in very handy sealed one-wipe packets which means you can slip one into your pocket and carry it around with you no problem. When I walk the dog in Wales in the winter, as you can imagine it's wet, windy and muddy so it's pretty handy to have one of these in my pocket so I don't end up going home with someone elses dog by mistake.
I've also used them on my camera lens and they do a good job there too.