I have both the 2 and the 3. Once you are used to the new screen, looking back at the ipad2, the screen is absolute rubbish. but the software is not really there for everything to support the screen. The ipad3 is much slower, like when i flip pdf magazines, it takes some time fo images to sharpen. The battery is worst for heavy usage, and I can feel the weight difference significantly.
if you are happy at ipad2, dont go and look at the new one. If money is no problem, by all means, but I still feel the build quality has dropped from 2 to 3.