The current state-of-the-art, machine-learned, CCSD(T) based force-fields for condensedphase water are substantially beyond what it was even 5 or so years ago. At that time there were two machine-learned CCSD(T)-based FFs using the many-body approach, WHBB and MB-pol. In these FFs, 2 and 3-b interactions for flexible monomers were obtained using permutationally invariant polynomial regression 15 fits to thousands of ab initio 2 and 3body interactions. These were rigorously tested against direct CCSD(T)/CBS results for the electronic dissociation energy (atomization energies) of isomers of the water hexamer.