Hello - long time Mac Pro user who has been considering an imac for some time, and just saw that the new ones have been released. My question is whether I would notice a speed increase going from my current Mac Pro to the new basic 27" imac. I don't really care about the thickness or the form factor; I just need something that will last and be hassle free to use day in day out. I have been to a shop to test out the iMacs last month, but unless I can sit and work on it for a day it's a pretty pointless exercise for me - hence posting here. My current system is 5 years old - and the speed seems fine to me, I am rarely frustrated. But I do worry about it dying as it's so old! Model Name: Mac Pro Model Identifier: MacPro1,1 Processor Name: Dual-Core Intel Xeon Processor Speed: 2.66 GHz Number of Processors: 2 Total Number of Cores: 4 L2 Cache (per Processor): 4 MB Memory: 8 GB I have 3 separate hard drives - one for work files, one for personal music & photos and one for the OS and apps. I always have Photoshop, Illustrator, Acrobat, Mail, Firefox open - and often maybe throw in InDesign or a HTML editor. My current machine has been switched off less than 10 times in 5 years, so this is another factor.