I bought the tunze nano on feb and only got the nerve to start using it 2 weeks ago. I didn’t sleep at all the first night I tell you. But it’s amazingly reliable I’ve already fell In love with it in only 2 weeks. I’ve been manually tipping off for almost a year so it feels great to have that relieved from me. My only negative is the magnet mount for the sensor. If you have AIO it works good but if you have just a normal tank with no sump the magnet holder is large and only fits under the lip of the top of the tank, so I had to lower my water level by an inch to accommodate the magnet mount. Otherwise I’m happy with the purchase