Who here has a MBP or rMBP and a MBA? Does having the two of them help increase your productivity? Have you seen specific advantages of having them both? Currently have a rMBP, but also thinking about getting a 11 inch MBA for the portability. Unsure if it will help me in productivity. The biggest use case I can see is hacking away at software that might cause the 11 inch to become unstable, while maintaining the rMBP has my main productivity laptop. By hacking I mean writing code and or installing software the could potentially impact the system has a whole. Using one laptop for bleeding edge stuff and the other for stable stuff. Not sure if it will be counterproductive or productive in having both.