Is 16GB of ram something that you really need, personally? Most people will never use that much. But there's something to be said about it, that the trend in Apple computers is non-upgradeability, so you should try to max out ram if possible. I know that this is something to consider personally as I'm looking to buy a new rMBP (Haswell, when it's available, hopefully soon!) to replace my early 2008 Blackbook with 4gb of ram. I want my computer to last for a long time -- another 5 years if not longer. My hope is that a longer battery life will contributed to a long computer life; if the battery goes 25% longer (for example) that means fewer battery cycles = longer battery life before it starts to die. Again an issue of the lack of user-replacable parts. To come back to the issue at hand. Whether or not 16gb is "overkill" is a topic that's been covered before, and of course it is related to what you will use the computer for. The problem is, 16gb of ram is only available on the 15" rMBP. That means that if one wants 16gb of ram -- for example to work with VMs or heavy-duty XCode projects -- then they are forced to get a 15" rMBP. For me this is a problem because I prefer the 13" form factor. But it's a choice that Apple makes and there's not much I can do about it. For you, do you need 16gb? Is it the sort of thing that's a make or break decision, that would push you to get a 15" rMBP over an MBA (regardless of processor power or battery life)? I'm not asking for myself alone (at least not directly) but am just curious what you think about this issue. Personally, I just can't see myself going from 4gb, which I am constantly pushing the RAM limits, adding only 4gb more. Theoretically Mavericks may help with memory compression but no one knows for sure how much that's really going to change things. Thoughts?