I have a hub behind my baggage are for both ADAHRS and Servos; this connects to the copilot Skyview. The forward hub is behind the instrument panel and connects to the EMS, ARINC, and pilots Skyview. Both Skyviews are interconnected together. Works fine with one exception. When either Skyview display is physically removed, the other skyview looses whichever hub was connected to the removed skyview. For instance, if I remove my copilot display, I loose ADAHRS on my pilot display. I am going to fix this little problem with a splitter--rear hub split to copilot display and then to forward hub. This will allow the remaining skyview to operate completely after the removal of the other skyview (work behind panel, repair display, etc). To be clear: I am not talking about simply powering down on of the skyviews--I am talking about the physical removal of one.
The hubs were a fantastic improvement and allow for simple, tidy, and straight forward installations.