For a free app, being able to put together and follow a training plan customized to your level is very cool. Had some problems with the cake day sync and customizing my plan (ability to choose a start date that is not right now would be nice) but otherwise this is exactly what I was looking for to plan my half marathon training and Ive already recommended it to many.
Rachel65253 about MapMyRun Trainer - 5k, 10k, Marathon, Half Marathon Training Plans, v4.0.2