The primer works best with dry skin, imo. The counters should have TF-worthy-packaged samples for you (mini-pump dispensers and all). I think whether it works for you depends on both your skin and the climate. Most TF artists that I've spoken with agree that it's not for all skin types. If you are placing a TF order, I've found that Raymond at Neiman's in SF is very generous in accommodating requests for samples for phone orders. He can also pull from other lines and put together an order for you, and email you updates with new TF things that arrive on the floor.
When I lived in Northern California, and in the summer, I think the TF primer was too rich. My skin is combo, and does pretty well in temperate climates. Now that I am in an East Coast winter, it was just what my skin needed. Windburn, indoor heat, it doesn't take long for it to show now that I'm no longer a teenager (cough cough). So I think that there is wisdom in the mixed reviews--it's not for everybody all the time. I think a "safer" primer with similar qualities is Burberry, meaning it will work for a wider range of skin types and climates. I'm on my second Burberry, it's really lovely and if anyone is shopping for primers definitely sample if you can.
By the way, WOW I am loving that Chanel micro-serum. Definitely getting the full size on that.
Here is a link to some of the backstage beauty at yesterday's TF show: http://live.tomford.com