The WRT54G has an option to only accept connections from computers with a WLAN adapter that matches a MAC address on the allow list (specified on the router). So that excludes any unauthorized person from gaining any access to your network resources (be it other computers or your WAN connection). Now the only reason left to enable encryption is to make it harder for people to sniff your data. However, chances of someone sniffing your data is so small that it shouldn't pose a real threat. The cons of encryption are setting it all up (lazy ) and some performance loss since there's added workload when encryption comes into play... What are your thoughts on this?