My spontaneous answer is No.
Tha main benefit of BDD and tools like specflow and Cucumber is communication with the stakeholders of the project and creating a shared understanding of what is to be built.
The main benefit of TDD is to take small steps through a solutions implementation, ensuring that you build maintainable and great code.
Or if you want; BDD is about ensuring that we're building the right thing, TDD is about ensuring that we're building it right.
I answered a question like this the other day on my blog, if you want more details; http://www.marcusoft.net/2011/11/bdd-and-technical-scenarios.html
