I have only had this kettle for a few months and it has rust marks on the inside. It also seems like the sensor for the water temperature is not that great because it'll keep boiling for a while before it beeps and it'll sputter when I pour into the mug from around the spout, I've burned my hands a couple of times from this. Over all not worth the price at alll and I am super disappointed in the quality of the kettle. It does not live up to the zwilling name at all.