Hi there, I have a late 2011 MBP (maxed out 2.8GHz i7, 16GiB) and found out the case will accept the mid-2012 logic board (2.9GHz i7). If I were to swap, I would get a faster CPU and GPU, USB 3.0, and I expect it to be more energy-efficient, and perhaps would run cooler. Oh, and it would take 10.14 Mojave as well Upgradeability and connectivity are must-haves. I tried different configurations on Apple's website, but a similar configuration (not even a more powerful one) would set me back at least $2500 before dongles, AppleCare and taxes, $500 more than what I paid for this one. And of course, no upgradeability / repairability, and possibly a less durable keyboard. Where would I find a 661-6589 logic board in good shape for a decent price? The ones I found on AliExpress (yes, they do have MBP logic board, surprisingly) and eBay currently go for well over $450, and I have to account for customs since these all come from outside Canada.