I personally found it was very beneficial. However, not all brain injuries the same.

Mine was a comparatively minor cerebellar tumour. I experienced issues concentrating and some short-term memory issues. I would instantly forget phone numbers and other things. By the time I finished the course I felt more confident.

At the very least it made me aware of deficits and helped me develop strategies.

We played lots of card games and simple counting and recall games. They introduced more complex exercises as we progressed.

It's possible that it will benefit an easier case like mine more.