Oddly the C6 was announced before the C5 I think is only now making it's way onto devkits.
> When I worked on WiFi for Google Fiber we tested it pretty extensively and didn't see any common building materials that attenuated 2.4GHz more than 5GHz.
Huh interesting, I might have to play with that at some point (I'm hoping either ubiquiti or openwrt will let me do that).