I will get a new retina macbook pro 15 late 2013, in the next weeks. I have a bootable image of all my old 'mac' system, which I took using the marvelous backup application 'superduper', from my previous mbp. I know that I can 'copy' my system, from external hard disk, to the new mbp. I have to say, that I am doing this procedure successfully, from 2007 that I had mbp with 'tiger', till today with an early 2011 mbp with 'mavericks'. I have heard many stories about what is better to do, keep using the compatible-older osx setup in new machines, or setup everything from the start. Many say that it is like 'format' procedure of ms windows, you just have to do it when you get a new machine, in order to be sure you will not have problems in the future. Others say that this is not needed in mac platform. Osx can run from one apple computer to another, and adapt itself accordingly. Apple has taken care of all its machines and osx versions, so why bother? The question is 'new setup from the start' or 'copy existing setup from the older mac and be up and running in 20 minutes'. Of course, new setup, needs some time, and find out how to customize the whole environment as you want, some apps need installation etc. I don't have time, that's for sure, but if I am going to have any problems in the future from the continuation of this infinite process through the years, of everlasting migrating my whole osx system setup, between different macs and osx versions, I will think very seriously to do my best and try hard, someday to find some time to make a new setup of the new system and apps. But until I find the time to do it, I will have not to use my mbp, because it would be not very functional for me. But, I should make the best choice and the most future-proof. I want your experiences and suggestions.