First off i'm have ADD but more relevant here I'm dyslectic. This is scary, over the years i have managed to more of less overcome my dyslexia (i now read and right slower then most but normally). The Crazy thing is that i find words "ciphered" this way to be easier to read smoother, like i don't have to think wile reading. this however only works some of the time.

I find small words like "tihs" and "raed", no trouble but longer words like "trouble" frequently impossible to read. This may be b/c 1st and last letters are not the only one that need to be swopped... scratch that, reverse it. The orangemen of the letters in the middle does matter. Though they do not need to be in order.
Also i frequently read using the Shape of a word "Brooklyn" is much easier to read then "BROOKLYN".

It's a cool tool though, and a interesting concept.
But, good god man, Where's the Spell Check?!?