In addition to the anti-theft capabilities, disconnecting the steering column means that you can store the bike with the handlebars parallel to the wheel, saving precious space in an apartment. While the N'Lock is the only locking stem that we could find currently available on the market, more are coming, as French company IXOW is launching their own version, the "Stemlock" in August, giving you more choices for the road.
Ethan Wolff-Mann is an editor at Supercompressor. He has never had a bike stolen. Follow him on Twitter @ewolffmann.