Before I purchased a UA plan I used the Training for the Uphill Athlete book to build my own “back to running” plan. (I suffered a bad injury that left me inactive for a significant period of time).
I found the book contained everything I needed for transition and early base phases.
Almost a year later, when I got to the stage I was ready to add in intensity, ME, specific strength, and so on, I ran out of road with the book.
I simply didn’t have the background or experience with higher intensity structured training to layer those into a plan. At that stage I purchased one of the UA plans and I’m getting great value from it.