I am the last apple hold out, the rest of my team switched back to windows machines over the last couple of years. I rolled my machine back to mavericks, a multi hour ordeal and now I can at least do my work. But I cannot have a machine that is constrained by an OS that simply does not operate reliably. It does not matter how sexy the OS is and how cool the features are. My living is tied to the ability to reliably use my computer and has dropped the ball for the last time as far as I am concerned. The last two Macs in our organization (iMac and Macbook Air) will be replaced beginning tomorrow. I plan to order the desktop tomorrow and have not decided on the notebook yet. I hate to let the machines go but gave me no choice. Yosemite has been a steaming pile of &*^% since it was released and knows it.