This product works beautifully and I'm blown away by the support provided by Andrey. I had a couple of questions and each time he responded to me within a matter of hours, always providing exactly what I needed.
One thing that might help others in setting it up that wasn't intuitively obvious: for each Filter type that you want to display, you have to choose a corresponding option in the Select Extra field box. For example, my first Filter type is "Category multiple select." In the Select Extra field box, I chose "Not extra field 1" because there is no extra field associated with Category. Once I figured that out, my filters displayed correctly on the front end.