Product review (2 stars): stoped working
Was ok when it worked.  The little argon cartridge only lasts for 3-4 bottles, and will discharge by itself if not used for a week or so.  This is annoying and increases the operating costs since I ended up using up a cartridge every couple bottles.  Worse, the refrigerator started humming loudly and then stopped working completely about 2 years after I bought it.  There's no service available from PEK, so it's just junk now.  I would avoid this one.