I've earned 1000 miles since I signed up, only once paying for an offer (I subscribed to Sherman's Travel magazine, which I really enjoy anyway). Even when I have clicked "yes, I would like to hear more about this offer," I haven't noticed any increase in junk mail.

I also earned my waffle iron and three $25 gift certificates to cooking.com through the Lightspeedpanel.com site, but they don't have travel rewards there.