I started mystery shopping with SQM and it was a good introduction to it. But once I realized I could eat for free and make some as opposed to just 50% reimbursement, I haven't done much for them.
The problem is that most of the dinners you have to spend $90 and get 50% back. So we end up spending more than we would normally spend and need to be rolled out of the restaurant just to meet the threshold.
Having said that, the flights are good deals in my opinion. If I'm going on a trip anyway, it's a good way to save 50% of my flight.
They are good to work with. I just wish they'd have more shops and more lucrative shops.