I did my first shop in Mar. 2006, that consisted of interviewing customers
of a well known fast food operation. This assignment lasted 4 days, 12 hrs. per day. The compensation was good and the work pleasant. I did a few more shops with nice outcomes, but one, which involved counting patrons at a movie
theater, turned out badly because of the ineptness and inefficiency of the
company that contracted me. They didn't pay me for one job, and when I
contacted the BBB, I found that there were a dozen complaints over a 12 mo.
period for not paying their contractors. This has soured me re mustery
shopping, and have more or less washed my hands of the experience.