Am aware there are a few devotees of this primer in the S&B ranks. Nothing else was as effective in mattifying without the awful, slippery, silicon-y feel (instead it had a nice chalky consistency).
Since this glorious product was discontinued, I have been trying out a few and the only one I have found that has anywhere near the same consistency and effectiveNess is Becca's mattifying primer.
Have just started using it and love it and thought I would share!