I’ve used the freeze dry 5 tray unit 6 or 7 times so far and it works great. My only concern is when I defrost the unit the water has a small trace amount of oil in it. There is no oil residue inside the unit so I don’t know where it’s coming from. I don’t think any oil is on my freeze dried food either. Unless there is oil residue inside the drain tube. This is very puzzling.