you really don't need one as the Trophy has gorilla glass.
That said I recommend a gel bumper/cover though to avoid accidental screen cracking or scratching after a nasty drop/bounce.
I actually was using an HTC incredible screen protector which I took of to replace with trophy one I bought offline. Long story short it was crap and I was wondering how many use screen protectors on their trophys. Do u think its good to use.