Love this bird feeder! It's easy to fill and the "raised" openings prevent the seed from falling out. It is designed to hold three different types of bird seed, but I've been using only one type of seed. Five finches have been feeding at one time; the grosbeaks, nuthatches and chickadees love it also. The squirrels have a hard time reaching into the side openings to get the seed, however, they've figured out how to slide the top up to get at the top seed holder. I suppose some type of weight could be added to the lid to prevent it from being lifted. I just purchased the same type of feeder for my mom to enjoy as well.
Good quality feeder. Nice selection of smaller / midsized birds. We've had everything from gold finches to red headed woodpeckers to blue jays, but it's difficult for birds any larger (even a little difficult for blue jays). Not squirrel proof, but works well with a baffle.