I have been waiting to purchase a new laptop (MBA or rMBP) for the past year. I currently have a 2011 13 inch MBP that I upgraded with a SSD + optibay HD, and recently upgraded to 16gb RAM. I would be leaning towards MBA for portability/battery life (disappointed it hasn't had a major update yet), except I am wondering if 8GB ram is enough for me. I don't do any heavy duty computing (eg. photoshop, lightroom etc), but I have to regularly use Windows 7 on VMware fusion to access hospital VPN when in the office/at home. Since I upgraded to 16gb RAM, when I look at System Memory I often have stats like this: Free: 100 MB Wired: 4.1 GB Active 6 GB Inactive 5.8 GB Used 15.9 GB VM size 331 GB Page ins: 6.25 GB Page outs: 100 MB Swap used: 194.2 MB Is it concerning I have so little free RAM, and so much inactive? I thought it's good my page outs are so low compared to page ins.