We have 4 units, one failed within two weeks (dispensed soap after hand withdrawn), it was replaced without undue hassle. With four units, seems like we use a fair qty of AA batts. Markings showing which way the batts go in could be interpreted in either of two ways, only one of them right. If clean, the IR hand detectors work pretty well for hands, not so well for a sponge unless there's hot water in it. One of the units is a little slow to dispense, slightly annoying. We do like the clear container to see soap levels. Don't care for the supplied soap; we use other brands of (better smelling and less expensive) soap, slightly diluted, seems successful.