I'm a Mystery Shopper for the Arcadia group in the UK & Ireland.. I only signed up because i shop in the shops that the Arcadia group own anyway so i might aswelll assess the staff & get paid €15 to do it!
Basically, i have a questionnaire & a list of things to do. I've to ask for an item in a different size & see how helpful the assistants are, comment on the dressing rooms (clean, tidy, enough space etc..), was the cashier friendly, answer any questions etc.. I do it all online, its great!!
I'd love it i was asked to be a mystery shopper for MAC or something so then i could tell them all in HQ that they're staff in Cork are nasty witches!