There are issues with interoperability of 802.11 gear but this writer makes some big mistakes: He says there's no certification process for Wi-Fi. I guess he's never heard of the Wi-Fi Alliance. Vendors can't use the term Wi-Fi unless they've gotten certified by the alliance. The problem is that the IEEE, which sets the standard, doesn't have a watchdog body that makes sure that vendors don't use the 802.11 designation unless they truly are in compliance with the standard. But that's the point of the Wi-Fi Alliance, which certifies and serves as a watchdog to the industry. Not to sound like a Wi-Fi Alliance spokesperson, but if you're really concerned about interoperability your best bet is to be sure to buy certified gear.