They're fine as long as you don't ask for more money for doing impossible jobs. This is the company that "fired" me when I asked for fair pay for a major PITA project.
As for doing MS for them, they mentioned that they "never" (their words, not mine) pay a shopper more than $10/hour.
If you don't mind having to write a 1500 essay for a FF shop, more power to you. This company demands extremely long narratives on every single question. A 10-minute shop turns into a 1-hour+ report, all done in word because they don't actually have a website to enter the reports into. It's all done through email.
Their redeeming factors were that they were the one and only local MS company and they pay fairly quickly. Until I was let go, the schedulers were easy to reach and work with.
I wish them (and the shoppers who shop for them) well but I'll never work with them again.