Just set it up yesterday, so I can't speak to its longevity, but seems to work well so far. Set-up guide could have been more detailed. However, the water is clear, very cold and very hot, and tastes good. I hope that it works forever.
I love my Avalon Water dispenser. It does a great job of nice clean super hot water for tea in the morning. I also use it for ramen, mashed potatoes, French press coffee and even hot chocolate.