I quite like RK. The interface is user friendly and not so technical that newbies will be confused. The free version is quite good with the premium version offering a wider variety of training plans. I love the challenges and little prizes like discounts in the RK store or for Saucony products. I wish their were more flexibility with training plans. Because of my work schedule, I might need to do a given run a day early or a day late. The reschedule feature only lets you move the training plan by week, not by day. Would also love to be able to amend the schedule from iPhone and not just computer. Would like to see Fitbit integration, too.
Smariej14 about ASICS Runkeeper—Run Tracker, v6.8.1