I have dyslexia and find this simulation pretty accurate. Obviously it's just a simulation though. When I read, letters aren't literally jittering around the page, but I do have to do a lot of "double-takes": looking back at words and thinking hard to decode them.

As a kid, reading aloud in class was always nerve wracking because of this. The game was to do these double-takes so quickly that nobody could tell you were doing all of this extra work. Often you read ahead of what you're saying so that you can double-take before saying the word.