The kiosks have been in all the McDonald's in the UK I've been to in the past 3 years (probably only about 6 tbh). They're great because you can get exactly what you want, down to the pickle and mustard and it entertains the kids whilst you're in the restaurant.

In busy restaurants the kiosks do allow a massive backlog of orders to build up. The kitchens cannot keep up.

edit: added 2nd para.