I can only really speak for Disciples of Magic (and Bard/Archer a little):

I find THM to be very useful, and different to play than BLM. Still, even with access to cure, stoneskin, raise, sentinel, etc. I think BLM is far better. Slightly better non-melded gear to add materia to should make it more likely that I choose to not top DPS, and instead support my party with THM.

I don't find CNJ very useful at all, though they do have damage mitigation, hate managment, resonance and AoE SR that they get that WHM doesnt. It's still not usuable over WHM for most purposes, maybe that gear will allow a CNJ to be support damage with the right materia in it.

I've been stoked about this gear for a while now, to be honest.