Nice. My office just got these for everyone about 2 weeks ago. At first my feet were sore, but now I'm fine after about a week. Note that I already jog for 20-30mins every morning so maybe I adapted a bit quicker than some.
I think the big change for me is that standing seems to reduce hunger and my tendency to snack on stuff. Also, my stomach has stopped making those gurgle-sounds that eating lunch then immediately sitting down for a hour seems to cause. I also feel more energetic. Since I'm standing, coding and listening polskastacja online radio(Google it!) I'm usually kinda dancing in place most of the day. ^_^
Perhaps sitting for long periods was a trigger for unhealthy snacking habits for you. That alone could actually account for a major difference in energy levels.
