The app was good to me as well.

A few years back, someone here mentioned that you can get multiple surveys from every invitation they e-mail you, so when you get the 'New Survey Alert!' e-mail save it into its own e-Rewards folder and check its survey link often. I'm US-based and the system will let me complete as many as three surveys in a day if I've hit them right after they load up the survey bank for the day.(seems to usually be somewhere between noon and 6:00pm Eastern time) Weekends are usually a little lighter on the survey options.