I was in WalMart yesterday. We got in line at the regular checkout and I watched to see who was last in line for the self checkout to see what the time difference was. What I saw was a couple of amateurs taking their time, chatting, looking over the merchandise and in general taking about 50% longer than the paid clerk. It was a toss up. I beat two of the self check lines, the other two beat me. One needed assistance and for all I know, they may still be there. Like most things in like, "it all depends"