The paid option is the best deal going in agility instruction- if you use it fully. In addition to what you see, there are boards titled (approximately): Handling in Awesome Style, Developing Jumping Skills, Developing Contact Skills, Aspirations, and Teaching. In addition to us "regular folk" posting a sequence, or a training question, or some other question, and getting answers not only from each other, but from Linda and some other wonderful instructors, Linda also posts some questions, challenges, courses and we provide answers, feedback, whatever is asked for- and then she clarifies or expands or give suggestions as needed. In order to take advantage of it, you need to have CRCD so you can post your handling strategy, and respond to others' strategies/suggestions. In addition to CRCD sections, people also sometimes post youtube vids of runs at trials, or training vids, for people to provide input.
There are a lot of people on the forum, but certainly not all of them post- but those who do get some personalized suggestions on an ongoing basis. Do a trial subsciprtion and try it out!
I have missed it a lot while I was moving, just got internet in my home so I can use CRCD at the same time as I'm online, and this was the first thing I did!