I'll start this off by saying that for the price you pay, the material used in these microfiber clothes is really good. With that said, if you are expecting to be able to reuse these as is claimed I wouldn't count too much on that. It could be the minerals in my water, but when I attempted to clean them as per the instructions I found that they did not return to the state they were originally and they also appeared to still retain dirt and grime. This was true even with ones that I used simply to clean off my glasses. The material ended up becoming rough and not soft like it was before.Cleaning GlassesAs many reviews have already pointed out, these microfiber clothes appear to leave small scratches on the surface of the lenses. While they don't appear to be deep or effect being able to see, it is frustrating given that this was the main reason I purchased these and feel that they shouldn't have this issue when they are brand new out of the package. Additionally, no matter what is on your glasses, they seem to smear it rather then clean it off initially. To make matters worse, if you have any water on them you will find yourself using multiple clothes just to dry off your glasses.Tablet/PC ScreensFor this, these things worked great and I have no complaints. They didn't appear to leave any scratches on the harder glass of my tablet and I didn't notice any damage present on my computer monitor at all.Issues-Dust and dirt clings to them, meaning when you are cleaning off electronics you can't easily shake them out and reuse them. You are forced instead to use another one to finish cleaning and hope that when you soak them that they don't lose their integrity when they dry out.-Water has a hard time being soaked up by them, meaning that if you are looking to use this on glasses or sensitive electronics I would look elsewhere.-They seems to lose their initial integrity after being washed in water and begin to take on a surface more like a napkin. While this could be minerals in my water, the same thing seemed to happen when I used filtered water to clean dirt off them.ConclusionIf you want something that is relatively cheap to clean off your camera lens or tablet screen I would recommend these. If you are looking to use them to clean anything off or take dust off things I would probably avoid these since they seem to not be able to be reused.