I came across this Blog post while checking into the Assistive Technology Facebook Group. If you're on Facebook and are interested in AT, this Group has a wide variety of members and I always learn something new when I visit.
I frequently get calls from parents about this very topic. It's worth the read. Also adding this Blog to our ongoing list of resources. Your comments are appreciated. http://jvanhouten.blogspot.com/2012/05/conversation-of-assistive-technology-in.html