After nearly 2 weeks of using the protector on my iMac I've really noticed a positive difference in the tiredness of my eyes at the end of the working day. The only slight annoyance is the tabs option for attaching the protector screen to the iMac didn't work too well as they weren't sturdy/sticky enough to keep the blue light screen up. Instead I used the sticky strips which worked much better (although they are very noticeable on a bright screen). Despite this, I still give the product 5 stars because it's definitely making a difference for me, and peace of mind for the health of my eyes is my main concern :)