> If you are unsure of what the outcome of what you write tdd will give you training wheels and help guide you. That may make some quicker for a little while.

In my experience, if you are unsure of how you are going to solve a problem, writing test only makes you slower. When you are coding exploratively, you will likely have to delete and completely rework what you did several times before you find what works. If you write tests for all but the highest level, those will just be scrapped along with the rest of the code.