I played with one of those for a couple of minutes 3 or 4 years ago! It was entertaining and I could easily whittle away hours of time with it and different sound profiles. One thing that is great about it is, it takes some complexities out of the process of creating music. The guitar is a very complicated instrument compared to many other instruments, this item does not get much simpler ;~)) The next musical purchase I make outside the guitar world will likely be the Roger Linn (yes, the creator of Linn Drums in the 80's)
Linnstrument! It is a whole new way (like the orba) of making music with intuitive gestures to do common musical tasks! I have exchanged some emails with him regarding an idea I have for a new instrument, and he encouraged me to enroll in some engineering classes to get it figured out ;~)) Here is a video of him demonstrating the
Linnstrument!