Well, worth it is strictly in the eye of the beholder, and until you do a few shops with them, only you can determine that. They were the first company I signed up with and I used to do shops for them all the time. I liked that they paid so quickly which helped build up my bank account that I have strictly for mystery shopping. After working with other companies, I don't do as much for them, because as others have said, their reports can be a bit lengthy for the amount the shop pays. I am doing one of the big box stores tomorrow (which I am now kicking myself for) only because my week was pretty blank when I looked at my schedule on Sunday. Now, I am overloaded which is far too typical in how my weeks end up. I actually ONLY work with them to do my tire rotations and oil changes as they pay nice bonuses for the make of the car that I drive. When I am stuck at home, I still look on their site and will snag up as many $3 internet surveys as I can if they are offering them at that time. Those are easy, and if I am homebound for the day, why not? Most people would not agree with me on taking those, but I will either find myself shopping online or making a little money online so, I take the latter and my husband greatly appreciates that!
I say you should try one or two, and if you hate it, you can bid them farewell.