As mentioned by Nursie, the Samsung Chromebook XE303 is much faster, look better and has a better battery life while still having the same form factor. It's also a bit more expensive (still cheap). The Android netbook has a bit faster cpu then the Raspberry Pi netbook, although I don't know about battery life, does anyone know? The keyboard seems a tad to small, can you type on it more or less comfortably?
My Acer atom netbook (similar size) gets 3-4 hours with Linux and ssd.