I just joined this and made an easy 6 bucks in less than 5 minutes. I guess you can't cash out until you have 30 dollars but hey, it doesn't seem too hard to get there (without buying anything I am thinking 2 to 3 months).
I just joined so I don't know too much about it but the little bit of money I can make from it for the small amount of time it will be worth it. I can make money from it inbetween posting on here and checking my email while my son is napping.
FYI - I would have one email address set aside for these type of things because you will get junk mail because of them. I have a few email accounts : 1 for friends, 1 for surveys and 1 for misc.