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Heathpack, yikes, hopefully your symptoms clear up and I'm glad it wasn't worse. Head injury can be scary. I've had some a couple severe concussion in younger days (college) when I was more resilient; I think one would mess me up pretty badly now.
In regards to the demo, I would say there is little to no reason to not try the demo bike. I tried a few during the SDMBA Mt Laguna "Trail Fest" last year and they were pretty fun - I would purposely mow straight over obstacles that I would typically maneuver around on my HT XC rig. If I had to choose between them and my bike I would still pick mine b/c it's faster under pedaling, but it was fun and good to know what a more capable bike is like.