I actually got a vermicomposter set up, but by "vermicomposter" I just mean one of those clean soup containers with worms in them. I mostly feed the worms decomposed leaves/twigs and banana peels. I don't know how to easily harvest their castings outside of putting their food at the bottom of the containers, but to do that, I have to dump everything into a temp soup container, put the food at the bottom and dump the contents from the temp soup container back to the original soup container. I'm thinking about cutting the bottom of two soup containers and assembling them together so I basically have a soup container with two openings, one where I can put their food and one where they deposit their castings.

But yes, it's cool to see him wiggle around and how there's very discrete layers with castings at the top, food in the middle, stuff that they won't eat like grains of sand below that, and water at the very bottom.