I used this on my t-zone for about a few weeks, and it helped a little bit. It was a smooth base, and my makeup went on really nicely. I used my Jane Iredale oil absorbing papers at about the same rate as before, and after a while, I just forgot to use it, so it definitely wasn't a Holy Grail product. I found using a good moisturizer helped more than using this at controlling oily skin, ironically enough.
During the summer, my mature skin is so oily, so I thought I would give this a try. I love the package, keeping the foam applicator and product separate. It took some practice to apply an even thin layer of the primer on my skin. If I had thicker areas of application, it didn't seem to matter appearance wise, only to me. The primer kept my make up looking fresh several hours longer than I expected. This is a summertime keeper for me.