Pros Faster Processor and more ram = no more spinning beach balls!
Cons stock Nvidia graphics card shows some minor glitches, especially web browsing in Safari.
Summary In Comparison with a 2.0 ghz dual core G5, the new intel box is much noticably faster on the front end (opening apps, using ilife and work suite as well as MS office 2008. In Illustrator, rendering of a 3d shape took hardly any time at all, where on the G5, I planned my bathroom breaks around it.
Overall, Intel and Apple did a great job on this release.
Pros Well built and reliable.
Summary Just brilliant.