A lady who has a frame told her she wouldn't be able to use the Horizon on a frame because, being a computerized machine, the vibration wouldn't allow the Horizon to tension properly. SO - although she likes the Horizon and hasn't had any problems with it, she needs to sell it in order to make room/$$ for the frame and another machine more suited to a frame.
I am not familiar with the Horizon or Jancome, but I don't understand not being able to use a computerized machine on a quilting frame. Or maybe it's the frame she wants. I have the Bernina 830 (computerized) and the Bernina frame, and I have not had any problems at all.