I have never done them before....like an idiot I got in the $500 double elimination one (lost weeks 1 and 2), a $100 eliminator pool (lost week 2), and a second chance eliminator pool starting week 4 (lost week 6)
They're a ton of fun and its another fun way to watch games on sunday (root for your team and root against the teams that your pool is heavy on). However, when you get knocked out, you feel totally bummed.