I began on October 21, 2014 weighing 246.0 and completed the challenge on April 21, 2015 weighing 211.8. I contributed $125 (plus $20 for weekly weigh in tokens-this is optional) and I won $292.07 AND a FitBit Flex (from the weekly weigh ins). I'd say I did pretty well for myself on this DietBet and I definitely plan to do it again in the future.
Note: I did forget to do my official weigh in for Round 2 so I lost about $30 there.
There's nothing like winning money for doing something I already planned to do anyway (LOSE WEIGHT!).