That's the one thing about it I didn't like. The fact that I could see a mistake made me want to try and correct it (but I don't see any obvious way to say 'that last word is incorrect').
To some degree, that's probably how the human brain works. If you say out loud "Show me pictures of Hump" and then just stop, it really does sound pretty close to "Show me pictures of home"
I am very, very impressed on how much better than Siri the voice recognition is in terms of speed and responsiveness. And, it works just fine on my iPhone 4, where Siri isn't an option.
CRFs are used in places like voice and images where recognition or decoding of a segment logically depends on the pieces near it.