The people who designed the new self-service tills in Tesco must have played a lot of tetris. It could be the only way to explain how the components came to be so arbitrarily stacked together. Obviously, the best place to put a paper money dispenser is in front of your knees.
I can imagine the average milk-loving environment-hating card-using customer just whooshing through these tills. However, bring in your own bag: dock ten seconds and two beads of frustration for every time it subtly accuses you of nicking stuff, all because you are trying to steady your bag. Buy some fruit: search for it, choose nearest approximate colour and then wonder why you are doing the job of a Tesco employee. Generally, wander at all off the path of the bovine-product bachelor, and you're condemned to the "wait of shame", as you stand sheepishly beside the till waiting for the surly till-shepherd to come over and press a button.
In summary: I don't like them.