I don't calculate functionality vs price so strictly. The joy I get from using a device is often worth more to me than pure monetary value. After all, a 3000€ laptop and a 300€ laptop don't differ in functionality all that much, but the respective user experiences well may. As to an ereader and a phone... they're different devices for different purposes. I see no point in comparing them. YMMV, of course.
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