Sensor taps - used them? Like them?

[mnpeasantry]

Fitting a new downstairs cloakroom soon and wondering about whether to install a sensor tap so the kids don't use leave the water running when washing their hands. Has anyone have any experience with them? Recommend, avoid?

FWIW, having typed this out, it has just occurred to me just how first world a conundrum this is.

[specialsubject]

Are those the things that never work properly in public toilets?

Easier to do some kid training, and I don't say that lightly.