I ordered one of these GGS glass protectors for my 5D mark III as soon as I got the camera, as I've used similar protectors for other cameras in the past. There were not many options at the time, but I am very satisfied with this one.
These GGS multi-layered glass protectors are superior to any other single layer film lcd protectors (like the ones you get on smartphones) as they are robust, rigid and highly scratch resistant. They have significant thickness, but do not compromise the screen clarity in any way.
- This protector is tailored for the Canon 5D mark 3 and fits well and is easy to install because it is rigid and you won't have any issues with air bubbles, the instructions are clear and concise (not that you wouldn't figure it out anyway).
- It's a two piece protector, so you get a tailored piece for the top LCD as well!
- For the price, it's excellent value for money IMO. I had a Giottos one for my 5D2 and it was twice the price and about the same standard of quality, but you only had one for the main LCD not the top!
- I find I have less trouble with smudging and fingerprints with this protector than if the screen were naked, one wipe and they all go away. Once on you don't ever have to worry about scratches on your LCD ever again!