神秘顧客有什麼福利?工作困難是什麼?

1. Practically none.

It is freelance rather than a job. Although it is possible for a major company to have staff mystery shoppers, they are extremely rare.

2. You don't choose your working hours. You have to be flexible.

只有人工冇福利，困難係你極唔想做嘅事，你都要做。