Macbook Air with other OSes.
So far, I managed to get
Linux Ubuntu 14.04 and Android 4.4.2 running off the SDXC slot.
Linux just by pressing the Options key and in the menu it appears as a Windows entry.
Android by using windows 8 bootcamp, with easyBCD.
Chrome OS is yet to crack, as I cannot make the Macbook to boot directly to the SDXC or the USB, this is an Apple hardware limitation.
Linux Ubuntu 14.04 makes use of all the hardware which is great.
Android almost, only Bluetooth does not work, but a BT usb dongle worked, and the trackpad only allows navigation no clicking, so an external usb or BT mouse is needed.
Windows2GO 32bit usb also works well, though I had to scavenge some bootcamp Windows 7 32bit drivers.
In all much better than Acer Chromebook C720P for using other OSes.