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We have two of these (different designs) for two of our grandkids. They know exactly which plate is theirs and they specifically ask for them. We only hand wash these with a sponge (the soft side of a sponge; not the side that has a tough surface for getting food off of plates). By doing this, and after many, many uses, these plates still look like new.
I have bought a lot of these plates. The divided is so nice because most kids don't like their food to touch so this plate works perfectly. It says that it is dishwasher safe, but after awhile the edges seem to get a little rough and then I can't use it anymore. I keep buying them because all of my kids love them.