Nope,never heard of this one - signed up anyway,and got rejected on my first survey :(
Apparently once they have a certain number of replies within an age/sex bracket,other applicants get turned down.
It will prolly generate a load of spam to my inbox,but if at the end of the day it tops up my Paypal account then I won`t complain.
http://www.myvoice.co.uk/ is a British version that appears to work,even tho I haven`t quite qualified for the 2000 points minimum cash in yet.