MAC Address Filters are very easy to use. There are some inherent problems when using WEP or WPA. Sometimes, the comptuer loses the key for unknown reasons and you have to put it in, or sometimes the key wont stay at all and you have to keep messing with it. WiFi is truly a black art. If you want ease of security, that will totally keep out amateurs, MAC Filtering is the way to go.
HOWEVER, when doing it, make sure to add your own MAC Address FIRST! First time I turned on MAC Filters, first last and only time I will make this mistake, I logged in my moms MAC address before the one of the wired computer (server) and when I clicked Save it logged me out of the router and the internet, and I had to finish configuring it on a wireless computer.