ELOS OsmoController Advanced Automatic Top Off ATO

I've had one of these units that has worked for over 5 years, flawlessly. I had another one that did not perform so well, and when the old sensor seemed to crap out, ELOS sent me a new one, no questions asked. They didn't even ask me to return the old one. Then the new sensor was not working in either, so they asked me to send in the entire unit. I did, and a few weeks later the entire thing was replaced - new pump, unit, and sensor. Again, no questions asked and the thing is working great. ELOS customer support is amazing, and this is a cool little product.Only downsides?There is no tube in the kit for the water to pump into your tank with. This is reasonable because all tanks and ATO placements vary, so you'll need to get one that fits your situation. Still, it would be a nice gesture to have it in the box. Two - doesn't seem to have the best redundancy if the unit or sensor starts to malfunction, but there great customer service makes up for that :) I doubt these are able to fail in the on position, so flooding is not a concern of mine, but do your research on that before buying :)