Last week I discovered a large crack in my ipad screen. I'm not sure how it got there and my kids and husband claimed to have no knowledge Anyway, I found a place in nyc who replaces screens and had good feedback online. They fixed it in a few hours, but when I got it home I noticed the screen is really inferior to the old one - there is a sort of visible gridline visible under the glass. Has anyone experienced this with a replacement screen? I'm going to bring it back but have the feeling they will tell me its normal. There is also a lot of dust under the new screen which I hope they can remedy.