The first time I encountered one of those machines was in our local Lidl in Ireland. I could easily have stayed all day slicing bread, hugely satisfying to watch.
Of course, the engineer inside me wondered how well the safety lockouts were designed such that there would be no risk of accidentally having ones forearms turned into neat evenly sliced pieces.
sigh... You cannot throw a statement like that without a Youtube link!
For those interested: https://www.youtube.com/watch?v=3JSvmCAwQEE