I've been a member of Opinion Outpost for about 4 months now and I believe they are one of the best research panels I've ever joined. When I first join I didn't take many of their surveys because I really didn't have the time. Then I started seeing that you can earn extra cash faster through them than most of the other survey sites I've seen. What I like best is that they send you about 3-6 surveys a week. If you qualify and complete you account will be immediately updated.
Opinion Outpost is on a points system 10pts = $1, your average survey will be 20pts and ranges from 10 to 20 minutes. I love doing their surveys because they are more interesting that some of the others I've done. This is my current balance for Opinion Outpost.