The part I like about the self check out is there are no mistakes.Usually the cashier makes mistakes and overcharges or rings up one more of something, or the price is bad.
I caught a couple bad prices ( higher than listed ) and was able to remove.
I can go faster using the self checkout than if I go through the regular one. I utilize my skills from scanning bulk stops and also my old preload skills of haphazardly throwing things as fast as possible. No cashier could keep up with me.