there are many simillar threads already answered 
but i would recomend that you take a look at the certified partners that each have their own forum.
browse the folder, read the threadsand you will get a quick idea about how people are liking the porgrams and who is reporting issues.. but more importantly how quickly are the issues dealt with… and so on.
Brightshare, Rewardsaffiliates, mainstreets and many more can be found