I use my Google Voice number on my resume, to prevent recruiters from calling my cell phone directly. I've noticed that clear speakers with the classic "TV American" dialect are transcribed pretty well. However, if they have even the slightest bit of a different dialect, especially Indian or Southeastern US, or if they mumble a bit, then it's hilariously bad.
Stuff like this:
hi zack this is anyhow calling from a car
and i actually i was looking part of the
apartment but i might come across your profile
on the google search in hi i understand you're
looking for approximately 400 caveman income
which is definitely i can talk to you but i
was just wondering that if you know anyone and
some yesterday and so and relatives so of
because the anyway i was looking for a job
for their business hey can you please a
deficit to me on my email address is and and
it's shannon N T S as in sam but i am E T
oddity of I T dot com i repeat it and and
at the car dot com on if you can divert my
call at 84 so i'm fine i need to little
photo a photo extension 8 if i'm not i repeat
841 598 double total of 4 extension 8811 that
would be great thanks so much for your time
My experience is that recruiters (and other people who leave a lot of voice mail) seem to be relatively easy for Google Voice to transcribe:
"matt hey this is todd johnson i work over dates 10 capital hey i wanted to see if you knew of anyone open for new projects we've got up i've done contract role that just popped in if you have a chance feel free to give me a call (206) 300-2120 to seattle based company python project 6 months see if you might be interested in that again this is todd johnson over it's 10 capital thanks"
Whereas casual callers talk faster and tend to get transcribed like this:
"hello it's sarah this is christal donna considering it's jamie at coming thanks bye"
What I really like is the feature in the new Android app that highlights each work of the transcript while playing the audio, and lets you skip to any word just by touching it.
Stuff like this: