It's not the screen that is scratched on my Droid, it's the surrounding metal frame. Glass itself looks very clean and scratch-free, but the frame is all scratched.
Yes, Gorilla Glass CAN scratch. It's just not as susceptible to it as other materials. My wife has two scratches from dropping her phone on it. I've been happy with the seidio screen protectors.
I ordered some Steinheil crystals the other day. They shipped me the wrong product and have not responded even once to my numerous emails requesting they correct the error.
The in essence stole my money so I would steer clear of SGP. Find their product elsewhere if you can.