I have only done 3 shops for them - 2 of those were last year (Sept 2013). I received payment for both in less than 30 days from the shop dates. They both were graded.
The 3rd shop was actually just 2 days ago, and I just went on the site and it has already been graded.
Just had my first payment problem with them. I did 3 shops, 2 the end of September and 1 the beginning of October. I just received a check but for only one shop, the one I completed the beginning of October. I have sent them a message via the Sassie link.
I received an email reply saying that the two shops I completed the end of September were being paid on another payroll run. I received my check yesterday for these shops. I am not sure why this required a second pay check as Sassie shows all three shops being paid on the same date. However I received good communication from them and am satisfied with the results.