I didn’t know Johnson made a J-scow unless that was before. they made MC scows. Anyway they have been out of the building business for some time.
Melges is the only builder of MC Scows now.
Given all of that trivia, MCs are a blast to sail, planing hull, leeboards, cat rig, and designed to single hand.
From what I have seen, new MCs have gotten relatively expensive over the years. I paid about $2000 for my first one eons ago, now a new one could be about ten times that fully equipped.