My personal experience:
I converted from QWERTY to Dvorak years ago when I got RSI in my wrists and forearms. It took about one (really irritating) month to convert, during which time my typing speed was useless. I'd hoped for a speed (ie. efficiency) increase, but that never happened; I still type about the same rate I did with QWERTY. However the RSI symptoms decreased dramatically.
I was disappointed to find (contrary to what I'd read) that I lost the ability to touch-type QWERTY.
Was it worth it? As compared to QWERTY: Yes. As compared to "hunt-n-peck", I don't know. Since "hunt-n-peck" basically types with elbows rather than wrists, it may be more ergonomic than either QWERTY or Dvorak.
A caveat: I only really use two keyboards: one at work and one at home. If you need to hop between several PCs (or share your PC with someone else), using Dvorak could be annoying.
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