Here are some of my friends and their assistive technology devices.
This guy is using a Dynavox V.. He is a middle school student in a LIfe Skills Class.
He loves calling his teachers and classmates over to him and then laughing!
This is Conner with his Vantage Lite. He got his device just a few months ago and already is make great gains in school. He is spontaneously putting several words together and now orders his own food when eating out with his family.
Meet Savanna, a first grader, with her Vantage Lite. She has had her device a year and a half now and continues to amaze everyone with her language. Her verbal skills are greatly improved and her academic skills are increasing. She is now telling adults the words she wants to have in her device! 
Here she is using her Vantage Lite to type the high frequency words her classmates are writing. By using the icon sequences, she can write the words and combine them to make sentences. Because she has delays in fine motor skills, she isn't able to write them legibly with a pencil, but with her assistive technology she is "writing".
Here's Jacob using two switch step scanning and a dynamic display device. He learned how to use one switch to move the scanning array and the second switch to select it. He started in preschool using a single switch message device and now has access to lots of vocabulary.
Can you name this communication device? This is a TouchTalker, circa 1990, by Prentke-Romich Company. My friend Daris and I were in the United Way Campaign of Central Indiana in 1991. He is 5 years old here (nevermind how old I was).
This highschool student uses her NEO portable word processor every day. She uses it for note taking, tracking assignments, and written output.