When I recently had a thumb injury that made typing painful, I took the opportunity to give the $179.99 Mac version of this program a try.
At that time the speech recognition engine was about 85-90% accurate to my best recollection. I first attempted to use Dragon Naturally Speaking for Windows more than a decade ago. Dragon Dictate 2.0 for Mac from Nuance is a speech recognition program that allows the user to enter text using a microphone instead of a keyboard.