I was signed up with a few legitimate companies for a while, but it got to be too tedious for what I was getting paid. Sometimes, you would be very restricted in what you could buy, and they would only reimburse for what was supposed to be purchased during the shop. Then they would pay a small amount above the reimbursement. In order to get paid, you have to fill out very lengthy and detailed forms. Somehow, I was supposed to remember the names and descriptions of everyone in the store, plus note the appearance of all the areas (including the bathroom), and note what was said, etc...but not make it look like I was a Mystery Shopper! Just too much for me, but I have heard of a lot of people who do quite well at it and really enjoy it.