A 2015 Chemical & Engineering News article on the "shape" versus "vibration" debate notes that in the "acrimonious, nearly two-decade-long controversy..on the one side are a majority of sensory scientists who argue that our odorant receptors detect specific scent molecules on the basis of their shapes and chemical properties.
In commenting on this work, Vosshall writes "In PNAS, Block et al... shift the "shape vs. vibration" debate from olfactory psychophysics to the biophysics of the ORs themselves.