I have always been paid by them, HOWEVER getting the money has always been a chore. I would suggest promoting programs who are known to pay, and who pay on-time or on a regular basis. There are too many good casinos out there to promote, then to promote one you have to email the heck out of to get your money.
I have not totally gotten rid of them just moved them way down on my sites, because in all honesty for me they do convert well.