i've tried many,many,many foundation primer and nothing beats this primer!! it preps my foundatios for a flawless and natural finish,and its oil-free!! 

I have to say that I love this primer!  Use to use mac, and had a roll problem (it would dry and roll up when I put on foundation).  This glides on, creates an oil free look that lasts all day.  Will by more!

I now have a couple samples of the Laura Mercer Foundation Primer Oil-Free.  This is a nice light oil-free primer.  This is formulated for oily, sensitive acne-prone skin.  A little goes a long way with this.  Helps to give a smoother finish before applying foundation.  Non-irritating to my sensitive skin.  Helps matte my skin (mementarily).  Claims to help the staying power of foundation, I have not really noticed much difference (probably because I'm hyper oily).

 

This does not however help control my oil, and I do not notice a difference when using this primer, as compared to no primer at all.