I want to share my decision about buying the new machine. I have been using MacBook Pro 15" Late 2008 for a while, near 7 years. Firstly, it came with 2.4GHz Core2Duo, 1GB+1GB Ram, 250GB original HDD. In the first 3 years, its phone jack and fans got malfunction, thanks to AppleCare, I'd got a new Logic Board. Then on the 4th year, I upgraded Ram from 1 to 4GB made it totally 5GB. I never formatted hard drive for perform a clean install on any version of OS X. Everything work fine. Last year, it went slow, not enough for my work anymore, I think I should buy a new one. I was waiting for a new 21.5" 4K iMac, but when it arrived I got a bit of curious : 1. spec & price - 4K screen is the only advantage. (a new accessories too) - not a latest generation of Intel CPU. - have to add $100 for a 'must have' 1TB Fusion Drive (that just was made low-cost) - 'extremely should' add more $200 for a memory upgrade, because it's unable to upgrade later. - no USB-C (actually, I just 50% agree with some reviewers for this point.) - no dedicate graphic card option for upgrade (I don't care much in this point.) 2. again, price - $1499 is OK, but actually we have to pay more for a standard and longtime aspect. At least $300. - I live in Thailand, which a currency rate went far high. 10% price increased. 3. old design, I smell a 'new' - i know this is not a "new design" year of iMac because a new MacBook steal Jony Ive's time, but may be next year. - according to Wikipedia, iMac introduced new design in 1998, 2002, 2004, 2007, 2009 and 2012. - So, you saw that, next year is the perfect time. - we may see a Retina screen on a new acrylic white bezel (as Magic Accessories gave us a clue) , or no bezel at all. - along with a Fusion Drive as a standard spec. As a long-time using plan, a new 4K iMac's spec & price combination did not moved me, so I need something new. SO, WHAT ABOUT MY OLD & SLOW MACHINE ? I turned to question myself, how can I upgrade with this old machine, 15"MBP Late 2008 ? I found that I can upgrade it to 8GB of Ram and a new SSD instead of old-time HDD. I suddenly went for them, 1 x 4GB Memory and 240GB SSD, and paid $159. And this is the first time in 7 years that I perform a clean install on my own Mac. RESULT ? 3 things: new memory, new SSD, clean Install. It is going very well. - first, I add memory to 8GB, I found some problem with starting up OS X on my old HDD, it so slow. - I decided to swap to new SSD and perform clean Install by USB Flashdrive. - that problem gone. - I learned that clean install in this cloud-era was very easy to do. - After finish install OS X, I went to Dropbox app, OneNote app, and choose some app that I really use from Mac App Store purchased list. (Your internet should speedy, though.) - then I plugged my old HDD with SATA-to-USB adapter and made it as an external HDD. I chose just some that I really need. (iTunes, Download, Movies, Music, Documents) - I gain many-times speed and more capability to finish all of my needed task. - now everything works! I'm writing on it. Additionally, I ordered ExpressCard to USB 3 to add more high speed USB for it. I think this spec may give me 1-2 more years before a new design iMac comes. Thanks for reading. feel free to give me comments.