I bought these screen protectors for my AICS Fusion5 premium+ Android Tablet, not knowing if they were going to be useful. I am glad I did, as they do serve their purpose very well and protect the screen from smears,finger marks and minor abrasions. They are a bit fiddly to fit, without getting air bubbles and dust trapped under the sheet, but with a bit of preparation and patience they do fit quite well. First off, clean the screen with a lint free cloth, a spectacle cleaning cloth works quite well. If there are any marks or dust on the screen, use a damp cloth first, then dry / wipe clean with the spectacle cloth. Make sure there are no dust particles etc left on the screen. DON'T use cleaners of any decription, as they are not recommended!
Then peel the backing off the protector sheet and align on edge with the screen edge, then very slowly start to lay the protector down, running a finger from side to side to clear the air bubbles. If you don't get it quite right, the sheet can be lifted to try again.
These sheets are a good fit for the Fusion5 premium+ screen, but I can't comment for other tablets. They do not seem to interfere with the sensitivity of the tablet screen either, which is definitely a bonus. It is a shame that they did not come with some instructions and a lint free cloth to help with cleaning and application, as I had to find a suitable one, by trial and error. The lack of instructions meant that I did waste the first sheet, whilst trying to get the technique right, hence a 4* rating, rather than 5*.