I've had it for over 18 months now and use it several times a day and it's still working as well as it did when I first started. Water boils a lot faster than a stove. The insulation isn't amazing so it's fine if you just want warm/warm-hot water after a few hours (my personal preference). Other people have also noticed that there are "rust" spots on the underside. As far as I know these aren't rust spots, just leftover tap water when you boil it. I've had similar issues with all of my hard water heaters. It can usually be cleaned with vinegar or in my sister's case it's just very dirty and she's still healthy.
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