Keep it.
Some people are just branded like cattle....branded to the point where they think its better to have everything Apple rather than something else, even if they're getting similar or worse performance at a higher cost (I mean, its Apple we're talking about), so don't bother getting rid of your Sony LCD if its doing the job. If you NEED to have a tiny Apple symbol somewhere on the display, just use on of those white Apple stickers. 😉
Do you need a widescreen display? Some people do, and don't get that from their Sony, but otherwise, who cares as long as the display is good?