Paid Online Surveys Questionnaires - The Best 4

I read an article supposedly written for Good Internet Money which enlist what may be the best 4 paid online surveys questionnaires out there. And to my excitement, I have to say that I have experience with 2 already.

The top 4 mentioned were:

1. Survey Spot (I am happy with this!)
2. Harris Poll Online (have not tried this yet.)
   
3. ACOP (not too many offers)
4. Global Test Market (this is a good one.)

As you can tell, I like Survey Spot and Global test Market the best. I cannot really say with Harris Poll Online as I have not been exposed to this until now. Maybe I will give it a shot.