Yeah, my brief experience and impression with these voice assisted coding is they require $300 microphone and a quiet room to get acceptable level of accuracy.
It probably is worth for physically impaired people (but i fear what 6hrs daily of this will do to their vocal cord). I am more interested in BCI technology which is where i see the future.
I'm a non-native speaker and have been succesfully using Talon in an open-office environment with a $20 mic - just to offer a different point of view. I've been using it for coding, not so much dictation so YMMV, but expensive mics, library environments or American news anchor accents are absolutely not required.
Talon doesn't require a $300 mic or a completely silent room. It works fine on my macbook air's builtin mic, and explicitly handles some interesting background noise scenarios (e.g. loud music, sitting next to a running dryer).
