BDD allows you to "think through" the consequences of your user stories and potentially discard or amend bad stories before they end up getting implemented and causing problems.
Again, this resonates well. However, I have had many cases where I did not really see what made a story bad until I had almost succeeded in getting it implemented.
In the end, I always want a way to make iteration 1 work. For it to be the only time I have to write something. However, experience is having done many many first iterations.
