Not good at all re: the rust particles.Spitting. Our water is hard on metals and they eventually corrode the inside and then it starts spitting out rust particles.
I should only use distilled water. I found that out too late. They are still ok for non steaming ironing.
As acceptable as our tap water is, I still find I have to give the electric kettle a good vinegar cleaning once a year to purge it of excess scaling and buildup, mind you we use the kettle daily.