One reason I tend not to upgrade my OS on the bleeding edge is because of potential compatibility issues with music software and plugins. Another reason is because I'm using (with a 2012 MBP without Retina) a Samsung 830 with trim enabled. Has anyone with a third-party SSD upgraded to Mavericks? If so, were you able to enable trim and, if so, how, and have there been any serious issues? A lot of people use Trim Enabler, but I've noticed that that utility hasn't been updated since before Mavericks was introduced.