This HP Chromebook 11 seems very similar to the Samsung Chromebook in specs. Both use Exynos 5250, 11" screen etc.

The Acer C7 Chromebook (Celeron) was much better performing. Running some javascript graphics, it seemed at least twice as fast to me. But it weighed 50% more (~1.5kg).

However, the new Acer C720 Chromebook is down to ~1kg, and it's even faster, using a Haswell CPU (22nm). http://arstechnica.com/gadgets/2013/10/acers-c720-chromebook... And google claims 8.5 hours http://www.google.com/intl/en/chrome/devices/chromebooks.htm... (cf 6 hours claimed for the HP Chromebook 11.)