[shiplet]

I've currently got rEFInd dual-booting Yosemite and Ubuntu on a Macbook Pro 11,3 (15", mid-2014, 2.5GHz) - and it works just fine. It took some tweaking - the Linux distro didn't come with Wifi support right away, and it took some searching to figure out the problem (you'll have to install the Broadcom drivers manually from the Linux boot drive). But after that got worked out, it's become a pleasure to work with.

The most frustrating bit was actually getting it to output at a native 2560x1080 resolution for my LG Ultrawide. But, again, there's a driver for it. The only reason I haven't switched to it full-time is I haven't had the time/luxury of incorporating it into my current workflow. Too many deadlines. But I plan to, and until then I'll just keep using Yosemite.