I have 2 of the ADF 75 feeders and I have had very good luck with them. Since I am tight with money I used the low cost food and run into dust since it had very little oil in the food mixture. This was my problem and I am now using 36 percent and having no problems . I will clean all the food out this winter as the feeders were not cleaned out good when I went to the 36 %. The feeders are about 4 years old. I always expect minor problems so I have been very pleased with there operation.