|This option allows guest users access to the Internet while keeping them away from your private network. By default, this option is off. Guest users should connect to the Belkin N+ Guest network.|
This is a very optimistic statement. Since 802.11N wireless has not been ratified as a standard yet (should be this year though) there's not guarantee that any other manufacturer's equipment would be able to connect to the Belkin wireless N network and actually have it work.
Personally, I wouldn't buy one of those until N has been ratified and all manufacturer's are building their equipment to the standard.
It is a nice idea though, and will be useful once N's been ratified and you know you'll have interoperability between manufacturer's equipment. Until then, it's wishful thinking that all other brands will work together and you'd look silly trying to help customers get connected when they problem is the equipment isn't talking to each other correctly due to the router being a non-standard device. Although I'm quite sure all Belkin wireless N NIC's would communicate with the Belkin router just fine.....
I would avoid WEP encryption. With the right tools it can be cracked in under 30 minutes easily. I would go with WPA encryption and a simple password you give the guests when they check in a the front desk.