This is the third soap dispenser were have purchased from Umbra.  The first one was several years ago to go with a vessel sink.  We liked the automatic dispenser concept and function so last year we bought a couple more from another company.  These both failed within several months.  We replaced them with 2 more Umbra dispensers.  They keep working.  They have changed the design a bit since our first one.  They are larger and dispense less soap.  I think both changes were excellent and needed.  The only annoyance with the first one is it needed to be refilled often.  The changes corrected this nicely.  The amount of soap dispensed with the new ones is entirely adequate.