Hey! I tried this in an effort to save milk when I first got my machine! Very interesting! Two main observations though, I could get a swirl happening with the water, but I couldnt translate that to getting a swirl with the milk. Definatly a change in consitancy with the microfoam. (Im still a microfoam newbie :P)
And surfing was fun too! That definatly helped out. Actually being able to see the tip and the steam working its magic was great. I had a thermometer in there just for kicks too! I noticed that the water actually started to splatter at higher temps compared to when it was cold and made surfing impossible, just an interesting little useless fact I guess.