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.

 

The MA at the Laura Mercier counter gave me two samples of this primer.  It is a good primer and makeup did last a long time, but it feels like a light weight lotion on top of my moisturizer.  I won't be buying once the samples run out.

I do love this primer. It is a bit pricey..but a little goes goes a long way. It makes my skin smooth ..so that my foundation goes on more evenly. One of the best reasons that I like it is that is clear...so it doesn't mess up your foundation color. Keeps my mu fresh with very little touch-ups if any.