We have a couple small ones (intended for home use) at the country club I work at. I have to thin the chocolate out with a little vegetable oil, for Dark Chocolate. White Chocolate doesn't work very well. I haven't tried using Milk Chocolate, as my boss doesn't buy it in bulk.
Be advised that these things can get VERY messy. Drips and dribbles from folks dipping things into the chocolate, as well as spills in loading the chocolate, as well as cleanup. It's a good idea to either put some disposable cover down over the table, or something that easily washed.
Peace, Love, and Vegetable Rights!
Eat Meat and Save the Plants!