Funny, I just one of these at Home Depot this weekend and came to the opposite conclusion. Too fussy, have to hold each item at just the right angle and distance from the scanner to register, constant complaints about 'unrecognized items in baggage area', and you can't take anything out of the baggage area until completely done, which doesn't quite work when you have a few bulky items.
Where they really work is when you have smaller purchases and no large items or produce, zip in and zip out. Blasted things always complain about stuff in the bagging area when absolutely nothing is wrong.