I have seen Sulic and Hauser once. They will be back to my town in the spring, and I will definitely go again. I took my 8 y.o. son last time, and he was blown away (as were my wife and I). They definitely shred their bow hair to bits.
Nowadays, they seem to favor the Yamaha Silent series of instruments for live performance. Sulic did some cool stuff with a looper, and they both seem to enjoy using guitar effects.
Check 'em out live if you get the chance!