I get the concept: treat 12 weeks (3 months) like it's your year. That way it forces you to set up achievable goals and don't lose track of them. It makes sense. It brings a systematic way to define vision, goals, projects, plan each week and evaluate progress using a scoring system.

I think it works for some people, but for me, at the moment, it felt like too much pressure on myself. The basic concepts of having a productivity system are all there: goals, time blocking, weekly reviews. So, it's not unlike other systems, like GTD, for example. But there is this added urgency because of the 12 weeks time frame. Not sure it would work for me.