Some of the best MSCs to work for are not MSPA member, partly because they do not wish to support the political lobbying agenda of that organization.
In addition, most video MSCs decided not to be MSPA members.
The best vetting for MSCs is what you will read here, from real shoppers with years and years of experience. You can ignore the 0ne-post rants from folks who just seem to drop in to complain but never really explain just why they were not paid, or who explain that they did not follow shop guideline but still want to be paid.
MSPA will NOT tell you which MSCs may be months behind in paying shoppers and/or going out of business owing shoppers a ton of $$$$.
However, on these forums you will find out which ones are late, and/or may be "going under."
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.