This is the first year I've put out feeders as I haven't seen them around that much. I have at least three that stop by regularly and had to put out a second feeder on another window because they were fighting over the one. I have the suction cup holders and the feeders like Dorothy's on her bottom tier. They are the easiest to clean as they come completely apart and don't have any tiny bottle openings. So far a quart of sugar water lasts over a week as I don't put much in them because I have to clean them every other day. The birds are fun to watch.