I've been typing english and only english on Dvorak for 6 years. For my needs, I am very happy with it. There is one point I would like to make that the author

I've been typing english and only english on Dvorak for 6 years. For my needs, I am very happy with it. There is one point I would like to make that the author misses (and it's not unique to Dvorak). Learning an alternative layout can make you a better typist for the sole reason of requiring effort to learn it. When most of us type with QWERTY, it is effortless, however we also carry with us all of the bad typing habits we've accumulated over time - all of the stuff we did wrong on a QWERTY board out of habit that our typing classes tried to condition out of us but it still remains. When you try to learn a new layout, you're putting in more effort than ever before into typing with correct form. That alone is a big factor for why non-QWERTY typists perform better.