I've lost weight - sometimes quite a lot - every time I've used DietBet. I've also made a profit each time. If you can apply discipline to losing weight, you need to apply the same discipline to weighing in during defined 48-hour windows - which means some advance planning including on some occasions taking bathroom scales away in my suitcase.
If you meet the weight loss goals, and get your weigh-ins on time, you will at least get your money back, and in my experience can make a profit too - but it's the additional focus the process brings that helps keep me on the straight and narrow. (I've regained the weight afterwards, but that's my fault, not theirs.)
As time has gone by, the amount of social interaction in the chat seems to have decreased.
Length of Use: 2+ years
Bottom Line: Yes, I would recommend this to a friend
