Are they any good?

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I stumbled across an article that had been written (probably a paid to write) which stated that these sites were awesome and PAYING! Have you heard of these and are they actually paying as advertised? Are they as high a PTC as the article states? The sites mentioned were GPTCashCow, CrownGPT, RealCashPTC, Needafreebie, Cashmattress, and SimpleGPP. There were other sites mentioned too, but these are the only ones that interested me. Other than youdata, but I'm in Canada and can't register for that site. Any advice on above mentioned sites would be great, thanks.