Pro and Cons

E-ink display

Eyes comfort (+)
Battery consuption (+)
Working on the sun light (+)
Discreet (+)
Slow refresh rate (-)
Cost (-)

Coustomized Linux Distro

Battery consumption (+)
Easy to use (+)
Distraction Free (+)
Too Restrictive (-)

Coustomized Keyboard

Make button more easy to reach (+)
Save space (+)
You could find difficult then to swich to a normal keyboard (-)