I've been considering this for a while -- especially after the Yosemite upgrade, in which my machine has been randomly hanging [0], and in which my machine gets noticeably slower (cmd-tab takes a quarter to a half a second to actually finish switching and repainting windows) over the course of a few days of uptime. OS X software quality is very clearly not a priority at Apple, which is a shame, because this machine is still the best hardware I've ever had the pleasure of using. I don't know what my next machine will be, but if things go at the current pace, I imagine it won't be running OS X.

My previous Linux machine was a Sony VAIO SZ, running Ubuntu 8.04; it did basically everything that I needed, and my only complaint that I'd have if downgrading to it today would be the reduction in battery life. Is there a great set of laptop hardware to run Linux on these days? What do people use when they just want a candy-reduced window system?

[0] MacBook Pro Retina 15", Mid 2012; periodically, usually while I am scrolling through a web page, the machine becomes unresponsive (sound stops, cursor stops), and a minute or two later, the machine powers off. Sometimes it reboots on its own; afterwards, there's no kernel panic log. As far as I can tell, something goes wrong, and after a few minutes, the SMC's watchdog timer gives up, and shoots the machine in the head.