I love bzzagent, even though it seems nearly impossible to move out of the bottom tier, it's pretty good fun trying! I've been an agent since it started, and my only issues are that sometimes you'll go so long without being offered anything, you stop logging in- and then when you do you see a bunch of offers that you're too late for! Their email isn't reliable, so if you want to make sure you're up to date, log in every day. The reviews can seem to take forever to get approved and ranked, and the rewards they offer seems to disappear way way too fast. I have nearly 800 bzzpoints, and nothing fun...