One big negative about the erewards program is frequent difficulty getting credit for special surveys that are supposed to pay bigger amounts, such as $10 in erewards money. At the moment, I am still waiting for $10 credit on an Oreon survey about restaurant and fast food preferences that I took a few weeks ago. I waited for 10 business days to pass, then I sent an inquiry to erewards. Got a promise that the reward would be posted "ASAP," but STILL no credit.
The value of this program really becomes questionable when you spend 15-20 minutes on a survey, DON'T get the promised reward, and then have to spend more time e-mailing to find out what happened!
Kathy