What matters to me in terms of form factor is how lightweight and compact a device is. I want a light as a feather device that I can hold comfortably for long periods of time and travels easily. Hence devices heavier than 7 oz or with screen sizes larger than 6" are useless to me.
I'm a little disappointed in Kobo for going with large screens on their latest devices. You're getting into tablet territory with those sizes. Also, while Kobo is very innovative they seem a tad less refined than Kindle in some regards. Little things like adjusting the backlight on the Kindle are much smoother than the Kobo.
The reader that piques my curiosity the most is the Oxyn Boox Poke. On paper it looks great. Super light and slim, running Android in the background.
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