When you use the freezer, be sure to keep it CLOSED or the prism will fog over. While focusing, I used to lift the lid just enough to get my arm in to turn the focus ring. Once focus is
set you'll never have to open the freezer again. NEVER take it out unless you mean to leave it out for many hours or it will instantly fog/freeze over.
Absent that, it works GREAT the orders never move and processing goes way faster.