Im considering upgrading my food dehydrator. Currently I have a Presto unit that you stack the round trays one ontop of another and it heats from the bottom blowing the air up. Im looking at either the Excalibur or Samson. Anyone have any experience with either? From my research the Samson's big plus is how quiet it runs compared to the Excalibur. My Presto is one noisy rascal.