I suppose I have much to learn about SSD drives. All I can tell you is that after having one in my MBPr, I will never go back to a hard drive. I am anxiously hoping that Apple still has new iMacs to announce by year end and that purchase will also include an SSD drive. I really don't know much about SSD drives and once in a while I come across statements on other forums like "the more you write to an SSD drive the more it slows down." I believe I have heard a few hints here on this forum that it's not good to constantly write to SSD drives. On my laptop it's no problem. I don't do much file downloading or document editing or otherwise. All I do is browse and email. However, on my next iMac, all I will be doing is downloading files, editing documents and constantly editing (adding and deleting) things. Would it be better to add an external drive for all the things I need to write, edit to and delete?