I've had many pairs of the Nike Free's 3.0, 5.0, & 7.0. They don't all work the same.....meaning, that no cushion, barefoot stimulating experience that changes your body positioning via sensory feedback, changes drastically from the 3.0 to the 7.0. Meaning, the more cushion in the 7's doesn't allow for that barefoot feeling, or, more importantly your feet don't react like you are barefoot. Result, just another pair of shoes. Not the barefoot shoe with the ability to make strong lateral movements. Just my opinion....but, love the 5.0's trainer, loved the 3.0's runner, 7.0's did not deliver what I hoped.
They may work for you.....but, just a heads up,