I thought I would try them out on a site as I had space going unused anyway. They offered me up to 25c per click but that turned out to be on their self-promotion ads which are getting very few clicks. The ads which fit in with my site are only 5c per click. I'm going to let them run a while but I haven't generated enough to know whether or not they pay on time.
The other thing is that they seem to have limited inventory. The ads that were relevant ran for a few days and then stopped showing.