Lots of you are running Yosemite (https://news.layervault.com/stories/27780-ask-dn-are-you-using-yosemite), but are any of you running iOS8?
If so, have you had any problems? I keep getting tons of crashes on iOS8 beta 2. Sharing between apps constantly crashes the app being shared to. The UI in general seems really laggy and non-responsive. Beta 1 had crashes in it, but actually seemed more stable for me than Beta 2.
fwiw, I'm running it on an iPhone 5c.