I picked up three of these from a deal of the day last week on Amazon. $6 a piece. So I thought I would give it a try.
I used a png and engraved at 1000/80 270lpi.
It looked pretty when I started, but the details peeled off when I tried to clean it. It was my last one, I used up the other two trying to perfect the settings. Next time I will try engraving an acrylic sheet and debossing the cover.