Not for me. Take in consideration that I don't do a lot of shopping. Two of the maybe four times times I used a self check-out last year;

1. So I go to the self check-out. One of my items is on clearance. I scan it. It shows full price. turns out I needed to scan a different bar-code for the clearance. However, I can't remove the already scanned bar-code from the list, so now I need to call assistance.
2. My kids drink a lot of coke zero, so when it goes on sale I usually buy a lot of it. In this case, I took all that's left in the store. I scan one bottle, do a quick count and adjust the number of bottles accordingly. I place the bottle in my cart and realize I've counted one too many. I can't take it off, and now need to call assistance.