I was in the process of signing up with this company for one of their research study programs and while doing my homework I found a rating report through Business Consumer Alliance, check for yourself!
http://www.businessconsumeralliance.org/report/staywell-research-100090695
And I recently signed up for their FREE Consumer Ally Program and received a nesletter with a "Scam Alert" for this specific company, Staywell Research. Check it out!!!!!