I haven't experienced such a thing but it is just as wrong. I'm planning on getting some Dell IPS monitors soon and from what I've read, I think they can be trusted not to swap the panel type with future revisions.
Since such things are not common, I would have expected a stronger reaction from review sites. storagereview looked at the issue quicker than most other sites but again, they stopped pushing after a certain point (presumably not to burn bridges with OCZ). We recently had a reminder as to what might happen to sites that give companies a hard time about their products.
http://www.wired.com/epicenter/2011/...-pr-threatens/