I recently hired two new designers and two new workstations to go along with them. One closeout dual 2.7 and one new quad 2.5. Fortunately for me the new 2.7 G5 with 5gb of RAM and a 23" cinema displays arrived three days prior to the new hires so I've been playing around with it and compared to my old dual 2 Ghz (which will become the workstation of the second new hire), it feels dramatically snappier. I'm waiting to see what the difference will be between this and the quad 2.5 when it gets here. If the bump will only feel marginal than I'll feel that I somehow cheated myself out of the WOW factor of going from 2 to quad 2.5.....
...tough life...I know....