Conclusion: If you don't have a laptop or other mobile device with an 802.11n adapter, Asus USB-N66 is not a bad choice, plus you can use it as an on-the-fly access point. Be warned of a few issues, though.
Pros: Can use as AP. Supports dual-band 802.11n. 3x3 antenna configuration for better performance
Cons: Did not report correct wireless band. Slower performance than integrated adapter.
Asus USB-N66 Dual-Band Wireless-N900 USB Adapter review
3 December 2012
Conclusion: The USB-N66 did not further endear me to USB wireless adapters. As is usually the case in my experience, it's just not as robust a performer as using a 3x3 on-board adapter. However, if you don't have a laptop with an 802.11n adapter, it's not a bad choice. The bonus feature is the ability to use it as an access point, but there are a few software issues to be aware of with this Asus product, too. Published under license from Ziff Davis, Inc.
Pros: Can use as an access point, Supports dual-band 802.11n, Impressive 3x3 antenna configuration, Quite striking looking device
Cons: Did not report correct wireless band, Slower than integrated adapter