It really depends on your personal usage
Commuter especially must have a cover
I mainly use my KV at home so I figured a sleeve is enough plus I dislike the added weight..you know one of the selling point of KV is how light it is
A zip sleeve can also prevent dust from intruding my KV
I am amaze at the magnetic cover idea though,waiting for a review to see how it actually works
I like flush screen very MUCH!
It looks great and prevent tiny particle stucking at the bezel..erk..
Flush screen is one of the reason I didnt go for H20