I'm not sure I understand the difference. Sounds the same to me as what the S2 offers.
You can have a widget set up to quickly start a walking exercise(may have to do a walking exercise first before the widget option appears) . And when you're done with the exercise it gets logged, map distance, speed, heartrate, etc.
Alternatively it can do it automatically like I mentioned before. It won't log a map in that instance, but it will automatically kick in after 10 min and give you a little buzz after ten minutes to let you know it's being tracked. When you're done walking it will log it into the app on your watch and your phone.
I do walks daily and I just use the widget if I'm going to do anything substantial. The only other health widget I have set up is the pedometer one so I can check my steps if I don't have one showing on my watch face.
http://forums.androidcentral.com/at...first-exercise-gear-s2-not-so-great-final.jpg