I've never had problems with Fatwallet posting.

And when I have a successful transaction (I use them for PL and Expedia) I enter the details in their 'tracking ticket'... amount I should get, confirmation #, date of travel.

Then I can simply browse through uncredited click throughs and if I see one I should have gotten credit for but didn't I have all the details in front of me to file an online claim.

I've never had one not go through w/ Priceline. But I recently had a couple (for the first time IIRC) not go through w/ Expedia. I entered the info in their online form and within an hour they credited the $, they didn't even make me wait.

So this is just one data point, but I *have* been happy w/ them.