I was skeptical of this whole thing from the beginning. I'm generally content with my life and don't really have any "big dreams" so much as a desire to improve my every day life through mindfulness, zazen meditation, exercise, going outdoors more, starting work on time, etc. A lot of the prep work at the beginning (and there is a LOT of prep work) is focused on concrete, measurable long-term goals, but I was able to adapt it to suit my purposes and decided to give it a try.
I am about 2.5 weeks into using the journal on a daily basis and I do kind of love it. I have been able to use it to great effect for my modest goals. My favorite part about it is the daily planning aspect, it's absolutely wonderful to be able to pick out a handful of tasks that are most important that day - and the way I strive for balance is including both work tasks and self-care tasks like those mentioned above. It's flexible enough that it accommodates the fact that my needs change daily. Some days my most important task is work-related and some days it's just going for a walk. I even eked through some meaningful sick days with this journal, emphasizing true rest and reminding myself not to overdo it. The weekly planner has also enabled me to fit in more of the things I want to do - like study the Buddhist sutras, go outside every day, and do some reading related to my (private) number one goal. As a result my life is more full of the things I want in it. It's nice to check in with the journal in the middle of the day to see how I'm progressing and help me re-focus on my goals if necessary. I also appreciate the evening reflection, and I think the fact that the space is limited in the daily section is actually to its benefit - I find it's helpful to summarize my day and key takeaways in a concise way. The daily habit card is another clever addition, and keeps me on track.
The only caveats I would add is that something about the tone of the introductory text was really off-putting to me, veering into toxic positivity or like pressure to "dream big." That's not really my thing. I would also mention that the "spirituality" measure is a little theistic, defining "spirituality" as daily prayer, as opposed to say, meditation or chanting. It would have been trivially easy for them to change "I pray regularly" to "I engage in some spiritual practice regularly." Just something to acknowledge that there are a lot of different way to be spiritual.
Overall though, I am so glad I found this journal (thanks to Catherine Price and the Power of Fun squad - she mentions it in her book.) Now that I have it, it's hard to imagine parting with it. I would encourage anyone on the fence to give it a try.