We couldn't help but feel that Apple's new 802.11n AirPort Extreme base station is a disappointing introduction to 802.11n. Our actual throughput was just 15-20% faster than 802.11g and far below 802.11n's promised potential.
Based on our tests, AirPort Extreme significantly under-performs other draft 802.11n products in the marketplace: ZDnet reviewed Trendnet's N-Draft PC Card and router combination, and saw 83 Mbit/sec; LinkSys and Netgear 802.11n clients both achieved 72 Mbit/sec in ZDnet's testing. The best sustained throughput we got with Apple's solution was just 35 Mbit/sec.
Unless Apple significantly improves wireless performance with software or firmware updates, there is no compelling performance reason to upgrade existing 802.11g-based AirPort hardware, but AirPort Disk changes the value proposition somewhat. The ability to plug in a USB hard drive and share it to both Mac and Windows clients, with discrete user accounts, is definitely worth a look. Although we identified performance limits on writing files and in multiple simultaneous client access, we feel this is an excellent feature for home users. Since it supports multiple attached disks (via a USB hub), AirPort Disk also provides expandability for the future."
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