I work for a veterinary clinic and we have bird feeders all over.  We joke that we only have them for the squirrels to come destroy and eat all of the bird seed.  This feeder was super easy to put together and install and so far so good!  The squirrels spend their days trying to climb up and get into the feeder only to be deterred by the baffle.  I can't promise that they will never figure it out, but for now this is a clinic favorite!