I would have given this feeder 5 stars if the glass bottle had a larger opening for filling and cleaning.  I thought that the red plastic top was a screw-on lid (like the feeder that I was replacing had).  It screws on, but onto the bottom of the glass container, not the filling end.  The filling end has a very narrow opening and a regular-sized bottle brush will not fit into it for cleaning. I don't even want to think about how hard it will be to clean the base.  I am quite disappointed with the product, overall, but the birds like it.  It's all about the birds...