I have been using them but I never put more than one roll of 120 onto each reel - I am afraid of unknowingly overlapping the two rolls. This has happened to me with the Jobo plastic reels, despite the built-in stops.
Hewes has confirmed that the 120 reel is actually a 120/220 reel and that YES!, it will take a 220 roll of film.
They are so convenient for my workflow: I don't have to unspool the film from the reel for the wetting agent solution - I simply place the whole reel into a container with the Photo-Flo. They are also easier and faster to clean and dry.