As far as PTO implements, I have a brush mower and the rototiller. I've found the linked PTO to be quite nice when using the rototiller, as I usually have to do it around big trees and if the rototiller grabs the roots, my first reaction is to press the clutch and the PTO stops without breaking anything.
However, I don't like using it with the mower because once you press the clutch or lift the arms, it will stop the PTO and apply the PTO brake. The inertia of the mower spinning will just burn the PTO brake really fast. It's not a problem with the rototiller because it spins at low RPM and doesn't have that much inertia going on.