Their customer support (or lack there of) is a little problematic.

Generally all my credits post fine, however, god help you if they miss it.

My last credit still hasn't posted, and this is from Jan. What's worse, follow up with general inquiries (not all the time, 1 a month ago, 1 a week ago, and 1 yesterday), and it's fairly evident they are being ignored. Never a reply back.

You are pretty much at your mercy if they miss your cashback. I've stopped using them since Jan since I'd like to see them credit me before I dip in again. However, I do note that I am still getting referral cashback (which I assume is one of the two in my referral chain from the Conga line from the SPAM section of this site). So, they 'are' still working.

My advice, since they are not all that reliable in crediting cashback, break up large orders into smaller ones if you can to hedge the risk of a missing cashback. You will have no real way of communicating with them unless they want to communicate with you.

I also noticed that their forums are closed to new posts, so, you can't even complain there with hopes of generating some attention from support.