I am very happy with the Display on the K4nt. I do not need more resolution to have an enjoyable read.
I like the Dictionary (but rarely use)
I don't Sync to other devices
I don't Annotate (Write in a book

)
I love Page turn buttons (but wish they we flipped and more top sensitive)
The 5 Way is good, it just needs to be more spread out (Glove size is XL) for bigger fingers
The bookshelf is good and bad (native, Calibre PI's can help)
Bad
No auto Series collections: Manual or Calibre PI
No native EPUB w/DRM support (walled garden or Alf)
Good
'New' (to device) Flag
return to Last place read (my PEz returns to the last ADE Block)
Progress bar

Battery life (WiFi off)