Even then, a 1.7 Ghz dual-core Cortex-A15 is not even close to be 'only a little slower' than a five year old 2.5 Ghz Core 2 quad. With a bit of luck it's going to be a little faster than a 1.6 Ghz dual-core Atom.
The whole 'review' reads like a paid advertisement, it's a shame crap like this ends up on the HN front-page. The guy is basically saying you get a Chrome browser for $249, as if that's a good thing. Because "it's the future, it's going to revolutionize computing". He doesn't mention using the thing for any other kind of application except internet browsing, then concludes with the following brilliant quote:
>> This Chromebook represents the true future of the PC. It's cheaper than any device that's remotely comparable to it be it tablet, laptop or any of the hybrids. It depends not on the local computer but on network services to get things done. Today, that motto has been made reality in my hands by Google and Samsung with the ARM Chromebook. This really does change everything.
Give me a break... :-/