Question for inbetween - I'm already in pretty good shape for a marathon, physically (already completed GOOFY this year). Do you think that a November attempt is too aggressive? I'm also currently alternating between my Asics and VFFs. Do you see that as a problem? Thanks
From my own experience, I think it's doable, but being ready for a shod marathon may make the transition harder as you may need to cut down significantly on your mileage. Everyone transitions differently. Prior running gate, muscle development, etc can mean the difference between weeks, even months of transitioning. Something that I have incorporated into my training is an actual barefoot run each week. I am up o 4-5 miles at a time. Nothing has given me as immediate feedback to adjusting and tweaking my running form as these runs. A problem with VFF is that the rubber sole dulls the sensitivity to the ground and running process enough that it's easy to overdue a run and increase the chance of injury. Let's face it. It's just way to fun to run in them. Throwing in a barefoot run on pavement or cement can help you understand what your feet are really ready for. I'm no coach, but because you asked, I'm sharing these thoughts. Google Jason Robillard or Michael Sandler for their resources for transitioning. In fact, Justin shared a guest post from Michael Sandler and Jessica Lee regarding transitioning not to long ago.
Check it out.