Are these more like the Power Support crystal films?
After using PS crystal films on my 3G and 3GS and now trying these for the Iphone 4 because the PS won't be available till the end of July, I would wait for the PS.
The fit is much better. When I had them on, I could barely tell they were even on the screen.
The SGP has had some issues from what you can see. Dropping the ball and not providing a cutout. And now for me they don't seem to be replacing the ones that didn't get a cutout for the front screen protector.