portable adapter interface sucks
Why bother making 802.11ac with USB 2.0?
Either make it with USB 3.0 or gigabit ethernet port or dont' make it at all! Just like making hard drives with usb 2.0... you'll only get 60MB throughput.. which is lame. many m/b's now have esata... you could even use esata for the throughput...
Until they get portable device interface right 802.11 AC will just be an overpriced novelty niche..