I picked up this one for this year, but haven't done it yet. I did it last year with another MSC and it was pretty straightforward. That MSC is doing them again this year, but dropped the pay A LOT (and when I did it last year, they didn't cover the entire cost of my tax prep (which you really have no way of knowing ahead of time), but their reimbursement is quite a bit less than Measure CP's is. I tell them I am a mystery shopper if they ask -- remember, you report everything you make, not just those who send you the 1099's, so I need to explain what it is and how I track it. The MSC cleared this (the store wouldn't expect you to be mystery shopping them if you tell them you do it, and if they do, just lie!)