Hi everyone! My questions are: (1) Will I notice a significant difference in terms of performance among the MBA 11", rMBP 13" and rMBP 15" models? It's not a huge factor in my decision, but it is something I am having difficulty wrapping my head around, because testing it out in the store isn't a "real world" experience. To my eyes, the Mac Pro and rMBPs are about the same speed (in the store), though I suspect real life usage is different. (2) Besides the obvious drawbacks (price, weight, size, late in the product cycle), are there any issues I should keep in mind that might make the 15" rMBP less desirable than a 13" or even my current computer? For example, it seems to me that the keyboard on the MBA is wonderful, even after a year of constant use, and I hear complaints about creaking for the 15". To be honest, so many people have 13" models, I kind of wonder if there is a reason they are avoiding the 15" one. I currently have a 2013 11" MBA base model that I have enjoyed immensely this past year, with the exception of the relatively poor resolution and small screen size. I did a lot of traveling with it, and was very willing to trade performance and screen real estate for portability, but with the Broadwell delay (who knows when the MBA line will get an update or if it will get a retina screen), and an upcoming change in jobs that will mean I can probably function fine with an iPad when I have to travel, I am thinking about an rMBP 15". On a daily basis I typically use: Word, browsers, nvALT, Evernote, VoodooPad, BBEdit, DevonThink, Adobe Acrobat Pro (OCR for scanned documents), and Handbrake. I suppose only Adobe and Handbrake get the fan going on my MBA now, but there are frustrating lags at times in all of the other apps (a Word document with hundreds of pages, for example), and it would be nice to see a noticeable improvement.