Hi there. Yes, it's GGS, loads about which a quick google will find. I have a Giottos on my 50D, but the GGS is better value as it is cheaper and comes with a protector for the top LCD as well. The Giottos was simple to fit, and although I got it a little crooked first time, a little warm (not hot!) air from a hair dryer loosened the adhesive for a second fitting.The GGS should be as simple to fit also.