My personal experience is that I had my account switched to revshare from PPS for "poor performance." Out of the perhaps 80 other programs that I've ever used I had this happen 1 other time.
I do recall from GreenGuy's board that Green Guy himself also had his account changed from PPS to revshare for poor performance. So I don't think it's me.
On the plus side, they do have a decent amount of niche sites.
Conversions are pretty decent, but rebills have not been good
They do have a great crew working there, excellent people really.