I just bought an apple macbook pro 15''. There is a gap of 2-3mm on the left hand side when the screen is closed. The right hand side closes perfectly with no gap. I phoned apple and they told me that this is normally acceptable and is a good thing really as sometimes if the lid closes tightly you can get the mark of the keys on the screen.I have read other posts about this issue of a gap but mine is only on one side and feels as if the screen has not been balanced when fitted.