Mark, it also sounds like it has the potential to completely resolve some of my more day to day annoying problems like dizziness, sleep problems and headaches. This is different than just being able to exercise again, although I'll also be happy if that is the only outcome.

They haven't been able to help with any of the cognitive issues -- like my struggle with noisy places and trouble multi-tasking.

In any case, this is just an experiment. I had the time and money so I figured I'd give it a try and let people here know if it worked for me.

As for repeat head injuries, you can bet I've adjusted a lot of my life around avoiding it. I think I'll be an individual time trial specialist, so lots of space between me and the other riders! Not quite willing to say no more bike yet though...