The DMTs don't dish, ever, but they can and will lose their diamonds over time. With a light touch and some luck your diamond plates can last many years, possibly outlasting you. If you lean on them, they can die quickly (months to a year or so). This is why I lean toward the interrupted surface DMTs as I honestly have had much better luck with longer life and better surface quality out of the box. I have and use both. I also have to say many of the cheaper diamond plates are showing up with much better quality than in past years, but are still buyer beware.
All of them benefit from being cleaned from time to time with Barkeeper's Friend cleanser.
Did you mean the interrupted or the UNinterrupted?