Had to chime in on this one.
PWP has not only been about one of the easiest programs to promote, but they have paid me consistently since I started and are very fair with bumping up your rate after you send them some decent leads. In fact, they are so on top of things that they would send me emails out of the blue telling me that they were happy with my traffic and have increased my pay rate. I didn't even have to ask.
Here's another perk: I can't remember if it was Christmas or New Years, but I got a bottle of Dom Perignon and some pretty high end chocolates from them. That's a pretty smooth move in my book and other networks etc. could learn a thing or two about how to treat us mere affiliates.
Seriously, they are one of my favorite offers to promote and they do take good care of me.
Paul (no, just kidding)