I like the buttonholes better made with the vintage buttonholers than with the newer machines. That being said, if you don't make clothing or other items that need buttonholes, then how useful would it be?
I have 10...have not tested all of them yet, but use them when I make the spousal unit's Hawaiian shirts, or doll clothes. The eyelet cam for the buttonholer is cool too..I have fun with that one!