I did the Garmin Coach Marathon Plan and it really did not prepare me for the length of the run. My longest run was 10 miles during the duration of the training. I would love to see it prepare me for longer distances instead of doing strides, thresholds, and tempos. Will there ever be an option to have Coach Greg or one of the other coaches do a plan similar to the half-marathon plan but for the full marathon? That plan worked so much better, and I also liked that it had the success predictor. I'm really disappointed that a device mean to train for running isn't helping me do that in a accurate or effective away.