A couple of years ago, a sublaptop with a credible performance and a similar size to these machines would cost twice the price of standard, cheapo, bottom of the range 15" laptops (and then some) for the option of portability.
Now, you can have the portability of a sublaptop at a sub-laptop price, taking only a very minor hit in performance (yet remaining totally capable of everyday tasks).
Basically, they're smaller and cheaper than yer average laptop, rather than smaller and more expensive.
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Re: So...where is the cut-off...
A couple of years ago, a sublaptop with a credible performance and a similar size to these machines would cost twice the price of standard, cheapo, bottom of the range 15" laptops (and then some) for the option of portability.
Now, you can have the portability of a sublaptop at a sub-laptop price, taking only a very minor hit in performance (yet remaining totally capable of everyday tasks).
Basically, they're smaller and cheaper than yer average laptop, rather than smaller and more expensive.