I have been using the Yosemite beta and it has been pretty horrible. Constant visual glitches in Photoshop CS6, crashes with display glitches in Sublime Text and really long pauses anytime I try to save a simple document for the first time. e.g., save a new 100KB JPG in Photoshop? 1 min or more. Save a 100MB+ PSD that's already been saved? Instant.
Would've happily avoided the beta but the only way to screen record directly from an iOS device and the Apple-recommended way to create preview videos for the app store involved Yosemite and iOS8.
Would've happily avoided the beta but the only way to screen record directly from an iOS device and the Apple-recommended way to create preview videos for the app store involved Yosemite and iOS8.