The initial switch was a real problem for about 3/4 weeks. Productivity at my job plummited, but only for the first week. After that I got used to the keys. I was a touch typer qwerty until I switched to dvorak. Now it takes a little longer for some letters to hit, but mostly its muscle memory, so if I switch after a long time no usage, I'm hitting the qwerty keys like the old days in no time.
I quit on dvorak after a year or so, because my new laptop had backlit keyboard and I didn't want to waste that feature. But after a couple of months I switched back (now to dvorak programmer), because qwerty felt funky. You'll notice the qwerty hand movement after using dovrak for a while. And backlit keyboard is handy still, becuase now I see the qwerty keys and know which key is the dvorak one y = f j = h etc.
a tip: decide first which keyboard you want. I started out with regular dvorak us, but the switch after that was to dvorak programmer, and I still fiddle sometimes with the ; and ' (which are swapped with dvorak and dvp)
For dvorak-programmer, getting used to the new symbols takes equal amount of time, and hitting the right number sucks with shift+num and the order in which theyre put, so I use a keypad for typing numbers mostly. But holy shit, those keys are nice. No shifting for a curly or round bracket is a fucking relief, also the dash (-) on ' is way better.
I dont think its worth it though if you want to get rid of hand problems. My left hand starts to hurt after 4 to 5 hours, and that lasts until the day after. The prbolem for me turned out to be the keyboard, I bought the microsoft ergo wireless sculpt with the fat mouse and its less painful to type for long periods of time. The reason dvorak is not worth it per se with hand problems, is the learning curve and the lack of actual everyday typing profit imo. I'd recommend programmer dvorak, but remapping keys is not hard, so sticking with qwerty, but mapping funky key combinations is a solution. Vim is practically unusable btw (but im an emacs user so idc). That said i'll never leave dvorak, qwerty just feels crappy after using dvorak.
I didnt like this keyboard, the spacebar is terrible
I program for a living, and dvorak programmer helped a lot in improving my hand health. Brackets are way easier to type and the dash has a great spot. The dot and comma are easier to type imo (fingers up instead of down). The 9 turns to + and the 6 to =, which is nice for + typing, but the = took some getting used to.
A real pain in the ass is "ls" command which is "p;" in dvorak and the f is a bit hard to hit (y).
If you switch, which I do recommend, never look back. At one time you'll have to handle qwerty again and you'll get that dvorak is superior