Someone linked to it 10 days ago for me (thankyouthankyouthankyou). I've inputted everything I've eaten in the last 2 weeks and all exercise (mostly housework) and I've lost 4.5lb just by recording what I eat.
I told it I wanted to lose 2lb a week to reach my goal weight (next February) and it calculated how much food I could have (1045 calories). I've eaten more when I've done exercise and inputted it too.
It was completely spot on!
I'm so happy I could skip round the room