Silent, I've got the AP brand (same as Re-An only less price for some reason). Works fine for me.
It is selectable between half normalled and denormalled, and can be multed with another set of points by patching 2 modules together.
Normalling explanation:
Assume that you have brought a mixer insert point to the rear of the patchbay. You plug the send into the top jack, and the return into the bottom. A normalled setup will connect the top and bottom jacks on the back UNLESS something is plugged into the front and which time it will open that connection.
Half normalled allows you to just "tap" into the signal's output without breaking the rear connection (like a "Y" cord). Patch bays are usually wired with the signal out above the signal in, so you'd tap into the top jack for half normalled.
Denormalled provides no default connection across the rear jacks.
I have my mic pre's patch so that the mic input and preamp output are run to a single denormalled module (wouldn't want to connect the preamp's output to it's input). The inserts are run to normalled modules, so that even if I don't have a device inserted, they don't open the signal.
Hope this helps.