I recently went from using the power support crystal to the anti-glare and it was a move that I don't regret for a second. The crystal is nice, but when playing games on the iphone, finger prints/grease buildup or whatever you call it would begin to build up on certain parts of the screen until you begin to lose touch sensitivity on the screen, and would be forced to contstantly wipe the screens. Most prevelant on games where you are constantly touching the same area (i.e. fps or rpgs with directional control for example).
The crystal would also get oily from holding it to the face after a call. I finally got sick of it and decided to give the anti-glare a whirl and the fingerprint/grime build ups stopped. Is it as crystal clear as the crystal version? No, but does the retina screen still scream "awesome"? Yes........the anti-glare does not detract that much in my opinion and the benefits far outweigh the drawbacks.