The N600 from TP-link features two wifi access points, the first is 2.4GHz 300Mbps connection, and the second is 5GHz access point, also offering 300Mbps connections, giving up to 600Mbps of total bandwidth to play with. On the back of the N600 are 2 USB ports that can be used for office printer sharing, or you can hook up an external hard drive and turn your N600. An attached hard drive can also be configured to accept remote FTP connections. All the 4 ethernet ports are full gigabit, as obviously is the WAN port.
The built in firmware has a "Guest Network Access" mode allowing visitors to your office to connect to the internet without having to search for access keys.