I have a similar problem, namely the wifi running under Ubuntu 14.04 on a 10,2 (early 2013) macbook retina pro, is intermittent and drops connections. This results in vnc being cut off.
I tried the above and found that while I was able to change drivers, the above driver still drops wifi connections. Very irritating and hard to diagnose as the WiFi works perfectly then, for apparently no reason, loses its connection with no indicator on the front panel. After a few minutes, the connection recovers - or one can make it recover by shutting down and restarting the wireless.
I've filed a bug report with Launchpad.
The frustrating thing about all this is that under Ubuntu 13.04, the wireless worked flawlessly. Unfortunately, the problem appeared at Ubuntu 13.10 and I was forced to move away from 13.04 due to Heartbleed not being fixed on 13.04 and I use an openssl secured VPN with my machines.
Is this a driver issue or a kernel-driver interaction issue? If it's just the driver, I'd really like for them to go back to the 13.04 driver on 14.04 until they fix the new driver.