"It used to be like pulling teeth to get her to read, now she picks up a book and reads on her own!"
"It's like the words are getting from the page to my brain faster" spoken by an insightful 4th grade student.
IM improves mental processing for quick and accurate transmission of information from the world to the brain and back out again. It's like updating the brain from an old flip phone to the lastest Apple Iphone. You can recieve messages with both systems, but one is much easier and clearer.