Public Wifi is near-universally terrible. Take WWDC this year. On the wired download stations you could get 300-600 MBit downloads. On WiFi you were lucky to connect at all. Heck, my experience is that wherever WiFi is available, 3G is usually both more reliable and faster.
At home, living alternatively in Japan and Sweden with 100 MBps connections in apartment buildings (=everyone has their own WiFi access point trying to squeeze in 100 MBit/s of BitTorrent uploads), WiFi is a continual pain in the butt and is often hampering my download speeds. I can't wait for 802.11ac, but I just got this fully-decked-out laptop last year and am not looking forward to spending another $3000
At home, living alternatively in Japan and Sweden with 100 MBps connections in apartment buildings (=everyone has their own WiFi access point trying to squeeze in 100 MBit/s of BitTorrent uploads), WiFi is a continual pain in the butt and is often hampering my download speeds. I can't wait for 802.11ac, but I just got this fully-decked-out laptop last year and am not looking forward to spending another $3000