I purchased Model FFAP50 about 6 weeks ago.  I have had two prior dehumidifiers from other manufacturers with poor experience on both.  I purchased the Frigidaire since we have had other of their appliances with very good luck and since they have been making refrigeration units for decades I felt they should know what they are doing.  The owners manual states that the new unit should be left on for a few days until the desired humidity is reached.  My new unit reduced the humidity in my basement from 85% to 50% in 3 days.  It now only runs occasionally and has kept the humidity at the desired lever ever since.  I am very happy that I purchased this unit.