Here's a tip. When you buy a new Iphone 4 and you buy a screen protector and you decide to leave the protective plastic screen cover on till you can get home to apply the screen protector, and then the phone rings while you are driving home and you answer, then you try to talk to the person and they can hear you fine but you can barely hear them, then you almost turn around and go back to the Apple Store to return it because it's clear you got one that sucks, and you decide to drive a couple more miles then you realize that the protective plastic screen cover doesn't have a hole cut out for the earpiece and then you are glad you didn't make a fool of yourself if you had taken it back. Good info right there.
and yes it sucks.