Is this for real or a scam?

I ran across this site and was wondering if anyone could tell me about it.

www.vindale.com/v/index.jsp;jsessio...

I know that sometimes these things are real, but how do I know the real from the false?

The site has been around for 8 years, so it's probably more trustworthy than many of the fly by night operations out there (they bought a trust seal as well) non the less these survey systems are often marketing tools aimed at getting your information to merchants, you might find that you have to sign up for product trials that turnover to paid subscriptions or have to pay in other forms in order to do your review.

The consumer comments here shine a light on the shady side of these operations:
www.surveypolice.com/vindale-resear...

voices.yahoo.com/beware-vindale-res...

voices.yahoo.com/how-cope-being-vic...

Relatively mild comments
www.complaintsboard.com/byurl/vinda...

Usful looking comments on a page selling something...
www.imreportcard.com/other/vindale-...