My understanding of the technology for this software, as well as for the Triple Play, is that they have to determine what note or notes were played, and that it needed at least 1 vibration to analyze to determine that.
So, that means that different strings and different frets will vibrate at different speeds, which then means that higher notes will be analyzed faster than low notes on lower strings.
I would think then that there would be some practical limitations to how fast one could actually play without playing too fast for it to respond.
Another issue would seem to me to be in how to control false-detection, while allowing for subtle nuance.
The above are speculation on my part, as it has been quite a long while since I played around on any sort of midi guitar setup, but I DO recall both of the above issues being present on whatever unit I had messed around with. Perhaps those issues have been successfully resolved, I am primarily a keyboard player so I am not up to date on current levels of this technology.
It would be pretty cool if these new devices would really work at a professional level.
Bob Bone