I've had my BTO 15" Retina for a couple of months, and have noticed that my 802.11ac connections are pretty awful. Pinging the router will show tons of spikes in latency, ranging from a normal < 5ms up to 1,600ms. I've also noticed that doing something like 'ping -l 1000 (router)' shows ~30% packet loss. This doesn't happen on 802.11n connections. In spite of this, Wireless Diagnostics says everything's a-ok. For reference, this happens when I'm in the same 12x10' room as the router. "Maybe it's the router?" you ask? This happens with a Netgear Nighthawk, as well as a new AEBS. "Maybe the channel?" Tried that, even as far as using the recommended channels in Wireless Diagnostics. I can't imagine this is normal, but I'm reluctant to take the time to hang out at the Genius Bar to be told it's running within spec. Anyone else experienced this?