David Pogue reviews four 802.11n routers, and finds only Apple's meets most of the promise, Belkin second: Pogue was unable to achieve the highest speeds promised by these routers, except with the Apple AirPort Extreme. That may be because all these early routers are single band (2.4 GHz) except Apple's. They may also all be much more susceptible to interface or back-off from adjacent networks, although Pogue isolated a lot of variables. As other reviewers have found, range is much better than bandwidth, but Pogue wasn't able to get more than 49 Mbps from any device but Apple's. I have only thoroughly tested Apple's router, and achieved 70 to 80 Mbps in unoccupied 2.4 GHz channels.
Pogue had kind words for Belkin's Draft N gateway, due to its superb installation instructions and labeling and its clear troubleshooting icons that are built into the front of the gateway. If there's a problem, an icon representing the part of the network that's faulty flashes an amber outline; network components that are okay are outlined in blue.
His conclusion? "If you’re in the market for new wireless gear and can’t wait a few more months for the “n” committee to finish the spec, buy the polished, upgradeable gear from Apple or Belkin." I'm not waiting for the spec to be finished, but rather anticipating a wave of firmware upgrades that should improve performance in the 2.4 GHz band based on the latest draft from the 802.11n committee. (Pogue says that Linksys didn't promise to him that the device he tested can be upgraded; the other three manufacturers did.)
While the draft was approved in March, it may be weeks yet before firmware appears for shipping devices that accounts for changes, especially in how 802.11n and previous 802.11 specs work together on the same network and in adjacent networks. The Wi-Fi Alliance will also announced certified devices sometime this quarter for Draft N, which would mean new firmware as a result of "plugfests" and other lab testing to achieve that seal of interoperability.