Originally Posted by SkinJob
"Google Now" is about the only major one I didn't try, as I am running Android 2.3.7, aka Gingerbread. Google is very confusing with its naming conventions, and I'm not sure what the difference is between "Google Now" (formerly Google Voice) and "Google Voice Actions". I did test Google Voice. I also tested Siri, as a yardstick.
Google Voice is completely different. Google Voice is a voicemail, SMS, and call forwarding service.
"Google voice actions" is also integrated into Google now, along with voice search, places, weather, etc. Google Now takes a lot of various google services and wraps it up into one great package.