Product review (3 stars): Works as advertised with one large exception.
I replaced an old unit with this one and when it works, it works perfectly. The only drawback to the unit is the two tiny, flimsy switches that must be depressed by the filters for the unit to either turn on or go up and down. If it goes down and one of those switches fails to be depressed, your whole unit will not work. Very poor design in that respect.