I've used
Dogfart for
at least 12 years.
I would have to say they are the most reliable for me.
I used to try to replace them with other programs because others had trials and huge
PPS but it never worked. Dogfart won every time.
Now they have recently added $1.99 trials on revshare.
I've never seen any other program that can consistently get 3 month joins that
rebill, and rebill and rebill.
A 3 month join on dogfart is like $100+ per sign up when all the rebills come in.