I have the glass version from Giottos on my D300s. Aside from the original double sided tape giving out (fortunately noticed at home with enough time to fix) I have found it great. It is easy to de-grease (nose to the grindstone and all that) and gives the impression of truely protecting the face of the rear LCD screen. Not cheap, but then neither is our "hobby" !
I also use the glass Giottos on my D7000. It is one of the best things I've purchased for my D7K. I often carry my camera bandolier style (strap across chest) and that puts my LCD panel against my waist. Not a single mark on the screen after almost 2 years. Love it.
When I have bought the Giottos or GGS in the past, it has been the stick on type (BF, I think is the current GGS terminology). They now have the Gen III which clips on. Is this as good as the stick-on type? (I see it costs more than twice as much on amazon: $7.57 vs $3.04!
GGS glass LCD protectors are great. I have one on my D4, D800, and D5000. They are inexpensive and very easy to attach. Much better than the plastic covers provided by Nikon and they won't scratch easily. If they do just replace them. Since they come direct from China it does take a while to ship. I got mine from Amazon.
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I just ordered Larmor screen protector for my Nikon D600. They seem to be made by GGS (http://www.larmor-usa.com/what-is-larmor/). I haven't really seen that many screen protectors made for the D600 even though it's been out for months. Once I get them and install it, I will do a quick review of it.
Finally got around installing the Larmor screen protector by GGS for D600. It was simple and they provided a wet wipe. You have to wipe with your own lint free fiber tho and does not come with a screen protector for the top screen. I apologize with the quality of the photos!
Fits over nicely without covering any noticeable portion of the screen. The images through the screen looks nice and bright w/o any degradation. I haven't seen Larmor during sunlight so I can't say how well the advertised anti-glare is but it doesn't seem any better without it.