I switched to Dvorak (actually programmers Dvorak) about 8 months ago and I have to say that the jury is still out for me regarding the letter placements, but man o' man are the first layer symbols really nice (of course typing numbers is a pain in the butt now). There is actually a lot of interesting things you should consider that I doubt Dvorak actually thought of when designing his layout:
One thing people say is that Dvorak is supposed to reduce errors, but having all of the vowels right next to each other and all of the most common letters in the most common places actually means that it is fairly common for me to write a different real word than a clear misspelling, which plays havoc with auto-correct and spell checkers. And yes, Android can be set up with a Dvorak keyboard using Anysoft keyboard and the alternative us layout extension.
I will never get over the fact that 'ls' are both letters for your right pinky, very annoying for you Unixers.