They have to be one of the worst ever inventions, I hate using them! All the big supermarkets are getting more of these things, and I've noticed that if you go in ASDA after (I think) 10pm there's no one on the tills, leaving me with no choice but to use these moody fuckin' machines that basically take the piss! Yes, I'm almost 3 times the legal age to buy alcohol but I always seem to wait ages till a pissed off looking assistant comes over to allow me to buy. Then if you don't place your items correctly on the scales(bagging area) it won't let you proceed. And that's if it scans items properly. And I think you need a degree in how to buy fruit & veg, it's a fuckin' pisstake. If you finally manage to get to press 'pay for items' without losing the plot it asks how many bags you want, so you have to piss about pressing more buttons wasting yet more time. And if you're paying by cash you have to put the note in a certain way or it spits it back at you! I got so pissed off a couple of years ago I just left what I was trying to buy and fucked off out of the store. Went to Aldi instead where I can always be served on the tills by someone who is usually always pleasant and efficient. Asda Tesco Sainsbury's and Morrisons are getting more self serve tills but their prices remain high yet they are cutting staff on the tills!