I learned to type Dvorak about ten years ago.
Dvorak, by itself, won't make you a faster typist. It will help only if you're actively training for speed-typing.
Dvorak will cause problems with any keyboard shortcuts that depend on the positions of the keys. Control-Z, Control-X, Control-C, Control-V are now in different parts of the keyboard. So is the hjkl of Vi.
But Dvorak is more comfortable to type. If you don't want to move your fingers from the home row as much, it is better.
And unlike Carpalx (http://mkweb.bcgsc.ca/carpalx/), Dvorak is available on most systems without extra software.
Learn it if you like. I strongly disagree with Frederik Dudzik: If you don't care for it after you learn it, you CAN go back. And it take less time to re-train yourself back to Qwerty.