I wish we could get a demo of remote dictation -- Sandeep has a good point about central processing at the office server using the Medical version.
The way I do it is through Remote Desktop, and it seems like the voice file actually has to make a round trip before it is processed in my laptop at home or on the road. This leads to occasional problems, especially if it is a bad internet connection -- a common problem when travelling.
I do find that the microphone in my Lenovo X-1 Carbon is just about as good as any fancy mike I have tried (at least, if I use it in a quiet place -- I don't think it has much noise cancellation ability-- and it certainly is more convenient.