My understanding of the whole purpose of these heads was that they allow you to change from landscape to portrait very quickly. That certainly seems to be Manfrotto's idea about them from that link. After all panning is easy with a monopod, and presumable once you set a working height you can achieve forward and back tilt by moving.
Many ball heads have a slot to allow this 90 degree rotation by the way so a ball head would achieve the same.
The other advantage of a head over no head is the quick release plate (if fitted)
I only know all this because I'm trying to decide what to do myself, and haven't yet made a decision, I have just bought a 2nd hand tripod and head with 200pl plate so that is tipping the balance towards a tilt head.