You may want to try the following Green Onions 15.6" Anti-Glare screen protector. I have the 14" version on my Lenovo IdeaPad Y470. It is not an exact fit though. There is about a 1/8 of an inch gap (maybe less) that is not covered by the anti-glare screen but overall it's not distracting at all. It is a bid difficult to install because you need to worry about dust and air bubbles, but that can be said for any type of screen protector.http://www.amazon.com/Green-Onions-15-6-Inch-Anti-Glare-RT-SPFG15HD/dp/B004DUM9AC/ref=sr_1_sc_2?ie=UTF8&qid=1370915629&sr=8-2-spell&keywords=greenonions+15.6%22+anti+glare
As ProStar stated, text and images will not be as sharp with the anti-glare screen, but that how these things work. Diffusing light means the filter tries not to reflect as much ambient light directly back to you. Thus, causing things not to be as razor sharp as they once were. But I have no regrets with it. Just keep in mind that it will take you a bit of time to get installed perfect (i.e. no dust particles and no air bubbles).
Here's a tutorial on how to install:https://www.youtube.com/watch?v=Kw4uN4T9Csk
Trust me, it looks easy but it is not especially if this is the 1st you are doing something like this.