It turns out the grey lines are caused by the passive 3D filter and they can be seen on some passive 3D TV's too.
It is also dependant on your vision and glasses/contacts prescription. Two [H]ard Forum user could see the lines with his contacts in, but not with their glasses and vice versa. I have had 3 people look at my VG23AH and none of them could see the lines with their glasses on or off and I can't see them either.
The bottom left glow seems to be the main issue and so far no colorimeter owning users/reviewers have reported units with different image quality. Usually low-mid range IPS panels have varying contrast/blacks and gamma. A good unit may have 2.2 gamma and 1000-1200:1 contrast while the bad ones will have 2 or 2.4 gamma and 700-800:1 contrast.
Lastly, if you download this and install it you don't have to use the Ypbr setting in the Nvidia Control panel, see this thread:
The 3D works over DVI too, even though it says it will not in the manual. Someone informed me of this after I created the review and I've tested it myself too.