Epoll gives you the option to redeem for United miles (it's burried on their site, but it's there), from 100 miles for 2,500 points up to 800 miles for 19,000 points. Current members get 100 points for every referral they make into the program, there is an active thread in SPAM for a conga line to sign up. Each survey is worth 100 (at least the first ones), and I can get the same 100 miles by charging $10 at a diner down the street with idine, so it's not the best use of time to get miles.