I've never had any luck with Verotel programs and the lack of any tracking stats make it impossible to even try to figure out why.
I used to do fairly well with several DHD programs but conversions on those dropped off a couple of years ago. When sales started appearing and disappearing from my stats earlier this year I pulled any remaining links I still had in my databases.
I've only had minimal experience with Epoch, not enough to draw any conclusions, and have never used the other.
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