Dvorak proponents usually claim two points: 1. Less wrist strain, 2. Faster typing
I've experienced both, but I know that the second point is controversial. As for less wrist strain, I don't think there's as much (any?) controversy. As a personal anecdote, I'm able to touch type both Qwerty and Dvorak. I can feel my wrists get sore after ~15min on Qwerty, but I've been known to go for 2 hrs at a time on Dvorak with little/no discomfort.
I've experienced both, but I know that the second point is controversial. As for less wrist strain, I don't think there's as much (any?) controversy. As a personal anecdote, I'm able to touch type both Qwerty and Dvorak. I can feel my wrists get sore after ~15min on Qwerty, but I've been known to go for 2 hrs at a time on Dvorak with little/no discomfort.