Michelle -
yes, there is a BAHA demo! It's basically the processor (aka tiny hear aid) attached to an elastic headband - since no doc would want to perform the real surgery in order to give a patient a demonstration
I've told the story lots of times, but I'll retell it for all you newbies.
The day of my demo, the doc put the headband on my head and told me to plug my "good" ear with my finger. Then he sat across from me and talked. Having heard nothing out of my deaf ear for 4 months, it was absolutely amazing to me that I could hear every word he said. From that moment I was hooked.
I would have had the surgery that very day if it would have been a possibility, but it took another 5 months to get approval for the surgery and the processor from my insurance company - it normally takes 4 to 6 weeks. While I hated waiting 5 months, it was worth it to only pay $400 in deductible.
As Jean mentioned, BAHA vs TransEar is a personal choice. There are those who couldn't imagine having a hole drilled into their skull and a titanium abutment implanted, but there are those who couldn't imagine wearing a hearing aid in their ear. In addition, there are those who adjust to being SSD just fine and they opt to remain that way. You need to do what is best for you.
Jan