I bought these screen protectors after they were recommended by a number of members on the Olympus UK E-System Users Group. I was a bit wary because I have never needed a screen protector before (the screen on my E-3 folds inwards to protect it when not in use) and was sure that I would make a mess of fitting it, particularly as I have Parkinsons Disease. I needn't have worried, it was simple and straightforward. OK, I didn't get it completely square but certainly it is good enough not to annoy me in use, and I didn't get any bubbles.
Another reviewer has commented that these protectors are cloudy and when you hold them up to the light so they are. However, this is because they are anti-reflective and they don't appear cloudy once fitted to the screen. In fact, they allow a remarkably clear view and the anti-reflective properties really do seem to work. Since fitting it I am hardly aware it is there, but it does provide invaluable protection against scratches and other damage.
To sum up, I think they provide excellent protection, excellent viewing, are easy to fit and secure once fitted, and are excellent value for money.