Just a too big of limitation for me, this should have never been developed this way. The idea of dumb APs and controllers are fine and all the tops guys, Aruba, Trapeze, Cisco do these but the APs do have IPs and therefore do not need to connected directly to the controller. I think extricom had designed this incorrectly in my opinion.
The main limitation to the system is each outlet must be directly connected to the controller by CAT5 cable as the outlets are effectively 'dumb' (all the work is done by the controller) the traffic to and from the outlets cannont traverse switches or media converters etc. However you can have more than one controller in a building, and these can communicate with each other over a network.