Last month I attended a Leeds PHP event where the guest speaker was Konstantin Kudryashov, author of Behat. He made a great case of how using BDD can really help you stay on track with the agile process.
Unfortunately I was sat directly behind a massive dan boy who spend the entire time enthusiastically nodding to everything that was said. I am sure he is a nice guy, it was just very distracting.
Richard had a very different opinion. He described most of what BDD did was nonsense. It works fine on your Symfony2 stack, but it just adds massive overhead for little benefit he argued, citing an example of how the company he is working with at the moment has just ripped years worth of it out.
I know what he means. It does work great on some stacks but become difficult on others. Also, I was working with a company that had done half their unit testing in it. I will not mention which mayor subscription TV company that was, but it was a great example of applying Behat to the wrong use.
However, on the whole I think BDD really can add a huge amount of structure and benefit to a product. You can knock “value” as a buzzword, but actually it just means actually focusing on what makes a product better and that genuinely is all that matters.