I've built two planes that use it. The hub handles all the low level signal interconnects and you wire the power and some auxiliary signal connections - the headphone/microphone jacks for example.
It makes installing your avionics a snap in my opinion.
The downside is that you have to have a good idea of how long you want the cables to be and that they are bulky and probably weigh more than an equivalent harness would. There are also more connectors, potentially adding points of failure - though 800 hours of experience in our RV-7A has shown that these are quite reliable. If you decide to swap out avionics it's very easy to have a cable made for the new device and usually all you have to do is make the power connections and plug the cable into the hub.
If you do use it make sure you put the hub in a place where you can easily reach it when everything is in place - this makes it a lot easier to inspect and plug/unplug connectors if you need to.
It makes installing your avionics a snap in my opinion.
The downside is that you have to have a good idea of how long you want the cables to be.
Mark,
Thanks. Did you make the cables yourself, or did you have Tim at Fast Stack make them for you?
I'm considering making the cables myself, and would like to know how feasible that would be.
-Dan