People like Bubbleman and Frenchy, and their friends in Barcelona have spent a lot of time experimenting with all available possibilities, and they now use these freeze driers... This is with good reason IMO, done right, it is the best way, but like the Vacuum Ovens for BHO, it is not a magic box that does everything when you simply press the shiny red button... They are complex professional tools that need to be set up and run just right for that advantage to be realised.