I like C2M the most among financial affiliate programs, it definitely deserves attention)!
Payouts please with their timeliness, everything is as stable as possible and without delays. Also there is a variety of functionality, a lot of useful and interesting, to take though its service sms mailing, additional monetization - it's cool.

Definitely worth a closer look if you have not yet decided which affiliate program to choose, purely from my experience I recommend.