I'm not sure whether I'm glad I saw this post or not. I was very happy indeed with my 2-day old LP2475w until I read this and realised mine has the same problem with a slight colour temperature gradient from left to right. I'd say the right hand 3rd of the screen has a slightly higher colour temp, giving it a pinkish tinge, sometimes looking purplish according to content. (And sometimes not visible, to be fair).
I am liking this monitor but in fairness to the above I did a couple of tests. Bear in mind I don't exactly know what I'm doing and I have no idea what the following numbers represent in real life.
Approximate white point measurement using i1 display 2 kit, repeated with same sensor and BasicColor 4:
Middle of screen 6500
Left side Center 6400
Right side Center 6880
I repeated the tests at brightness 0 and 50, much the same results.
Text: I do like the look of he text, remember I'm coming straight from a CRT. I do feel a little eye strain but I've put in a lot of monitor time over the past two days. The good news for me is no headaches or dizzy spells yet.
Black level: I've had this down to 0.1 cd/m while maintaining reasonable calibration, less than delta 2 error. I do like the quality of the black, even, smooth, although nowhere near CRT levels it is believable even in space sims. Full screen all black is not so impressive but still quite tolerable given the amount of time you spend viewing such screens. Black in the lower right and, to a lesser extent, left corners shows a sheen at times but nothing disastrous, a slight change of viewing angle and all is well.
Lag: Not a problem for me so far, I'm certainly not walking into the furniture in VTM:Bloodlines the way I was with the Dell 2408.
Image quality: Excellent, honestly from photographs and web pages to hi res modern games and old games scaled up from 1024x768 resolution, the image quality is outstanding. This may sound at odds with the white point variation, for that I have no explanation.
My CRT took a sulk last week and refused to recognise the colour green for a full 20 minutes and the wash out is becoming more of a problem. I could gamble on a 5 year old replacement or I could buy a new 22" with zero resale value. Decisions.
I'll live with the HP for a couple more days and see if there are any negative effects on my eyes. In general use it is a stonkingly good monitor, what chance of better appearing this side of next Christmas ?
Edit: I don't know my left from my right !