Well, that’s kinda what I did (except I knew a lot of the kanji in here, but I still liked to go over them again).
I wrote about my experience in more details in my level 60 thread.
I’d say it’s really good if they need the structure. If they can manage on their own, well, free options do exist, as mentioned already. That being said, if they haven’t done it so already, I feel like structure might indeed be their problem.