1) Size: small screen/light weight
2) Long battery life: 20+ hours reading time; I'm not dealing with need to recharge during a long weekend.
3) Multiple filetypes.
Without those, I'm not interested. After those, I start considering
Features (nav system, metadata handling)
Speed (page turns, 'cos e-ink is the only kind with the battery life I want)
Storage capacity
Irrelevant:
Internet of any sort
DRM support
International access
Text-to-speech
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