I use one, but only in the winter. Sometimes the suet will melt during the heat of the summer. Since food is so abundant now, it might take longer to attract the birds. During the winter I get: nuthatches, chickadees, downy and red-bellied woodpeckers and tufted titmouse. The birds use the fat as fuel and they probably don't need all of that energy for the summer. Plus, some of the birds that eat suet are insect feeders and now that there is an abundance of those, the birds will skip the feeders. I've noticed a big decline in the birds that eat from my sunflower feeders now.