I have sampled rosin and I have actually done some 3 years back when it was popular in Europe to check it up.
The smoke is nice but does not have the depth of good old Hashish may it be in the smoke or the high, something missing.
Rosin is an extract, made by pressing flowers or resin glands with heat, you have the same set back than with BHO and CO2 and loose the wholeness of the resin glands by treating the disc cell, membranes and fibrillar matrix of the resin head as garbage. The process of the whole magical transformation of 2 single and common molecules (terpenes and phenol) binding together into 80+ cannabinoids is unique to that specific resin head, we do not even understand fully the transformation. The entourage effect of the Cannabis plant is acknowledge by the scientific community, the whole essence of the plant is expressed in its resin and the shell that make the transformation. Clean medicine is important but you have to be sure that what you are cleaning is not important to the wholeness of the medicine