I definitely like them for up to 15 items and despite having issues with produce, something not reading right and needing clerk assistance, I still prefer it over the serve check out.
I use the cashier when I have big items like the 24 bottle water boxes as
they scan them without me having to remove the box from my kart.
As for the chatty cashiers, I can see how annoying it can be. I had
an ear infection once and both ears were almost shut down. I hardly could hear at all and did not understand what the cashier said and just nodded an occasional Yes, which probably wasn't right either as the cashier looked at me funny while I felt more and more uncomfortable.