Ordinarily I wouldn't mind using one, but last week DH and I were at Lowes and we had items that had been specially cut by a clerk and had no bar code to scan. A ticket had been hand written for the cashier to read and punch in by hand. Wouldn't you know it...no registers open with cashiers, only self-serve. DH insisted we leave and just left everything sitting in the cart. We saw quite a few others doing the same thing. Lowes definitely lost money in sales as opposed to what they'd have been paying a cashier to check us all out.
And PD...I notice you rarely (do you ever?) answer the questions you ask. Why is that?