If its efficient enough that washing a days-worth of clothes at a time won't raise water and power bills, I'm all for it. As it is now, I save up 3-4weeks of old clothes before I do laundry, because I hate walking down the street to my apartment complex's laundry room. If I could install something like this in my apartment, that would be fantastic.
Even when I lived in a house with a washer/dryer, you had to save up enough clothes to make the wash worthwhile (I have no kids, so that takes me a few days, not a few hours).