My title pretty much sums up how I feel about this product.  I've been using it for a couple of months, and it's just okay overall.

As a primer for makeup, it helps keep some sebum production at bay, but I still find my face feeling oily halfway through my day.  It doesn't provide much in the way of priming your face and creating a good base for makeup either.  For me, the texture of the primer is weird; it's a white paste that almost feels dry and doesn't spread that well.  It also feels kind of slimy itself, which may just be me.  It's definitely not my favorite primer to use when I'm putting on a full face of makeup.

However, I will use this on warmer days, when I'm maybe going for a walk or doing work outside, without any makeup on top of it.  Without the extra stuff on top of it, it's a nice, light way to keep my pores covered and lessen the amount of sebum.  I'm not super prone to breakouts, but my t-zone can get pretty bad, so this is nice to have on when I know I'm not going to put on makeup or just lazing around the house.

Not my top choice, but definitely not the worst primer I have used either!  Probably won't buy again though.