One Touch Voice Note is also good. I like the fact that it reads back your note to you and says email sent - great for handsfree use perhaps...

However, it doesn't attach the audio file. Big problem for me because if the speech to text is wrong, you would need to rerecord the memo or potentially have to decipher some gobbledegook message later on.

I guess that if there is no connection, it wouldn't work at all.