I've messed around with the various packages frequently and even recently. Regrettably I have a very abnormal speech pattern, I can't pronounce the letter "R" and the byproduct of avoiding it's use over the years is that I sound very strange too, people generally play the game "Guess Isaac's Accent" within the first minute of meeting me, and even close friends and family often miss bits. Strangely everyone loves it though, variations of "I love your voice" and "Wow, you're so good at explaining things" are two of the most common compliments I receive, but even I have problems understanding audio recordings of myself, so I don't have much luck with voice recognition of any sort.