Everyone should do this!
My husband and I just completed our life plan and we recommend this workbook enthusiastically. It makes you consider what really matters, instead of the unimportant stuff that fills up our days, and take the reins of your life. The process both validated many decisions we've made, and uncovered other areas and choices that need to be attended to. We're heading into the final chapters of our careers/family life, but its probably even more useful for those in earlier stages. The process fostered thoughtful conversation and sparked ideas we're excited to pursue.
Write, Open, Act.