I started mystery shopping around 3 years ago. I started with just one company at first because I didn't think it was real. I thought it was some sort of scam. But now I'm with about 5 different research companies and if I sign up with a few more I may be able to quit my job and just run my own business.
I've done several different kind of shops including: Bank shops, cellphone shops, dining, retail and sales, car dealership, fitness, credit card, upscale merchandising shops and more.