While my performance has varied over the past two years, my experience most closely matches Tom's.

Bitt, you might be looking at issues specific either to your environment or product.

The worst performance I've had with 5GHz was during a time period someone must have been using some type of wireless video monitor. Everything seems fine now over the past year, especially after moving the AP up to the second floor.
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Bruno
Twisted Melon : Fine Mac OS Software