Hello Ryan,
thanks for your reply. I am aware of the things you are mentioning - and from technical aspect this is what the customer needs and more or less is already installed (by myself  ) and I have also recommended to still use it - Like the last 5 years ...
But somebody has shown the customer the solution provided by Cisco which is very similar regarding the functionality - and I do think this additional controller is not necessary - however, somebody is trying to replace the loved WLAN Solution by Chantry/Siemens [greeting to Ronald Dvorak] /Enterasys/Extreme.
Some people are pointing at: with cisco the packet bridges out in the "dmz" and not at the controller which is placed in the management environment- this is not allowed... (I am not supposed to comment this in more detail...),
which would be quite the same if using a separate interface of the controller exclusively for guest access.
Many thanks to you Ryan
Regards
Christian