Games looks amazing!! That's the biggest thing I've noticed so far.
Black and colour reproduction seems great, though I am far from an expert and do not have any calibration tools or anything. Certainly a lot better than the Hanns-G, but of course you won't get the deep 'inky' blacks that will be possible with a more expensive monitor. I've tested it with some HD movies and it looks stunning really. A Hi-Fi nut might come along and turn his nose up, but for the price and considering I don't really know any better, I'm extremely pleased. I'm not sure how I can illustrate the quality of the colours etc. but to my eyes, you won't be disappointed especially for £140.
By the way how good is it having dual monitors?! I've got the Man U v City game on the Hanns-G, with internet and web design easily fitting on the main screen.