The Bullet Journal website recommends that you give it 2 months before you decide if it works for you or not. My 2 months are up and I have to say that I am liking the system. The journal has definitely helped me plan my time better and keep track of the things I want/have to do.
While I have always been pretty good at remembering what I "have" to do, there have always been a lot of ideas floating around in my head of things I would "like" to do. The journal gives me a place where I can pin down those ideas. In the past I would come up with ideas of things I wanted to do, new products I want make or just things I wanted to research. I would make notes on miscellaneous pieces of paper which I would get lost or worse think to myself I would remember, which ... well we know how that goes.
So while my journal is not a work of art like so many are, it has been useful to me. I doubt I will ever spend much time trying to make it fancy. but I do plan on keeping it going.
Have a fun day!