We've had them in my previous company. How different are they from the regular whiteboards? They probably look a lot cleaner than the white ones after years of

We've had them in my previous company. How different are they from the regular whiteboards? They probably look a lot cleaner than the white ones after years of usage. If the ink in the marker dries out, it is harder to read than it is to, from a whiteboard. Can't think of others for now.