I've had this about six months. I distill about 10 gallons a month for water changes in my aquarium. At first I thought it was engineered by the loser in a third grade science contest but after I got used to it , it is not a problem. The on/off button does not work. That's not a problem. I plug it in, it comes on. I only used the automatic shutoff a couple of times and it worked properly. I use a count down timer in case the automatic shutoff fails and also so I can (guess) the shut off time (about 4 hours with cold well water) and set the timer a few minutes before all the water is distilled. That way it is easier to rinse between uses and the minerals are not burnt on so badly. After 10 gallons (it usually takes a couple of days) I use a descaler and it is sparkly clean.