Savas K wrote in post #10184876
You don't need no stinkin's protector on Canon DSLRS.
Sure you do. The 7D and 5D3 don't have the cheap factor protector, the LCD is fused to the glass, so if something goes wrong you have to buy the whole assembly.
deadpass wrote in post #10186507
all canon dslrs already have a screen protector over the lcd. On most it's a very hard plastic, tough to scratch, but easy and cheap to replace (about 15 bucks). The 7D has a glass protector over the lcd so it's even more robust, however slightly more difficult to replace.
Correct. The 5D3 is the same as well. There is no cheap protector; hence why a protective screen is even more valuable.
dwarfcow wrote in post #10192538
lets all walk around in bubbles so that we never come in contact with anything, and none of our equipment ever shows signs of use

I prefer to look at clear images on my LCD, not scratched up crap. I'm not a "cover it with plastic" kind of person as I don't even have a case or protector for my iphone, but for my 5D3 I prefer to keep the LCD scratch free.
To answer thew OPs question, I prefer the GGS screen protector. They are glass and have the best optical quality. Very cost effective and it looks just like the stock read LCD glass.