I was promoting them up until I sold my tgps, sales were okay, as good as most but obviously not as good as x-art. I wouldn't ever drop them regardless, their content is good and surfers like it. Good for bookmarkers, they might not signup for that site but it keeps surfers around and potentially signing up to other sites I advertise.
Definitely a must promote if you run an art site. IMO
This is the reason for that program being a must. One of the hottest models in the biz.