NLAN's biggest plus is the people. They make sure its fun. They update half the machines every 9 months to a year, but they house enough units to fill a HL server :)
There really isn't much choice for gaming centers in MN & nlan is the best of the non-console centers in Duluth/Superior.
I still get calls for their lan parties & tournaments. If you plan on going, talk to their host & find out when the crowds for each game type show up. I think their old forums were "http://www.northlangaming.net/", but it's been a year since I left Duluth.