The difference in screen surface alone has a significant impact on the image quality. He actually wrote
one of the reviews you have probably read on the monitor and I have written another. When I wrote my review of the P2414H for pcmonitors.info I actually had a U2412M side by side with the monitor for a lot of the testing. The default colour setup, overall richness of colours and image quality is simply superior on the P2414H. The responsiveness is also much better balanced - and I've had a user who likes to game upgrade from a U2412M to P2414H and completely agree with that assessment. I am glad you're happy with the U2412M, but for the OP who starts by saying 'basically I'm a gamer' it isn't really the best choice.