As for any production variations I had probably lucky no dead pixels, highly uniform illumination and no noticeable halos, a slight yellow tinge appears alone at the bottom and right edges at completely white screen and on closer inspection to emerge, but it is not noticeable in normal operation. In direct comparison to my Samsung 2443BW with which I am more than happy for about three years, however, there is not only light, but also shade:
For more demanding tasks such as image editing with Lightroom and Photoshop Dell U2412M can certainly exploit its strengths, because the viewing angle stability and differentiation brightest and darkest tones succeed the built-IPS panel due to design of course again a bit better than even the best TN panels, but a very good such as for example in the Samsung 2443BW hardly stands after.
The latter has in turn with an identical image size (24 ") and resolution (1920x1200 pixels) for rather non-critical applications like Office, Internet and programming etc. which in practice clearly more appropriate, because smoother and quieter image display, whereas the Dell U2412M already quite clearly the so-called "sparkle" shows, which acts roughly as would a fine layer of dust on the monitor, which can seem a little grieselig the image and not greatly irritated a few users.
Because of the mentioned Samsung is no longer available, I call this example only to potential buyers should be noted that a good monitor with IPS panel is not necessarily better than an equally good monitor with a TN panel, as alleged tirelessly in many forums is (probably to be the in most cases priced higher purchase whitewash). In fact, it all depends on the main purpose of use, and then you should select the monitor without to be impressed by the hymns to supposedly higher quality panel types too much.