I talk to my computer at all times, including at the moment, with a mic strapped to my head. If the boom is at a slightly off angle -- say, 3 mm further from my head -- recognition goes to crap. And that's with the best retail recognition product on the market, which is *not* available for mic. Then again, house management requires a much smaller vocabulary, so recognition is easier. But OS X is so far from the forefront of speech recognition tech that I simply can't use it.