PineCone Research is the only survey site I have stayed with over the years. 

PineCone Research conducts on-line interviews with consumers from all walks of life to obtain their opinions about new products. To become a panel member, all you need to do is complete the simple form.  Registrants who complete the signup form online and align with the recruit target(s) and are eligible for membership consideration will immediately receive an email invitation containing a link, ID and password to complete the full registration process. The link takes them to a brief “staging” survey (6 minutes or less) to gather some further information about that registrant and their household, and to gain agreement to the terms and conditions for panel membership.