I find myself using the 3rd gen iPad much more than I used my iPad 2. Reading in iBooks, surfing the web, and responding to emails is much more enjoyable to me with a screen this good. I do wonder, however, what will happen once retina type screens are available across the entire mac lineup and if I will revert back to using my macbook as my main device like I did before.
For only a $100 upgrade fee after I sold the iPad 2, I am extremely happy with the new iPad.