I was very skeptical about survey sites as i have heard that they steal personal data from your computer and do not pay you. I have been victim of this fraud recently. My wife and CEO of my company were filling surveys from Global test market and what happened with them was really horrible. My wife cashed out six months back but her check of $50 never arrived from Global Test Market. My CEO received check of $50 but his check bounced. My wife also installed a chinese software from Global Test Market which said that it will pay $16 after 2 months but that software stole $4400 from my wife's paypal account. We got the money back but please stay away from paid survey sites because all of them are big scam.