I can add my experiences with the router ZyXel P-660HW-D1. I've got it configured with WEP-128 bits and the GS-911 won't connect to my home network unless I use WPA-WPA2 or no security at all. Since I've got a device that is only supporting WEP coding I struggled a lot to get the GS-911 connected to no avail, until I asked for help to Wayne who, promptly and proficiently, guided me to the key for the connection. This particular router is able connect with the GS-911 "infrastructure" mode only if the password supplied via the GS-911wifi Launcher application is typed in HEXADECIMAL (with no trailing "0x"). Once I entered the passcode in HEX everything worked like a charm.
I also followed Wayne's advice to assign a static IP to the GS-911 WiFi and now I no longer need to start that tool to access it, just type the IP in the browser or set it up as a bookmark.
Thanks a lot again to Wayne for his great support. Hope this can be of any help to others.