There needs to be a way to have UDFs apply to Mass Interactions in the same way they do for journal contacts.  When our org sends a solicitation we used to have a record of the donors segement, ask amount, etc. listed on the journal contact as UDFs for that solicitation.  Now with Mass Interactions we can't do that, so we are left with the choice of either not using Mass Interactions at all or losing that data going forward.  This should be a very simple fix that should have been standard in the first place.  Not very happy with the Mass Interactions switch over.