The trouble could be that the Janome reps aren't actively marketing 5.5 too. You need to ask your dealer to keep pushing. If they can find a part number on the Janome intranet site, it could help if your dealer has a rep. that isn't savvy about this (because Janome keeps hyping Artistic Digitizer over MBX).

Janome Institute is in a few weeks in Atlanta (a dealer event). Perhaps we'll hear more through our dealers about the future of the Wilcom/MBX partnership after then.