Rather than post in one of the bandwagon "it's hideous!/it's incredible!" threads, I thought we could have some nice discussion about things you personally like or dislike in 10.10. After using it for several weeks now... I mostly like it. Things I like in Yosemite: - The toolbar icon style is wonderful. I love it! The "square lens" effect in toolbars (such as the Safari address bar or iTunes 12's currently-playing song is similarly beautiful and functional. - Title bars getting shrunk down. I've been wanting a unified no titlebar look since forever. - Graphite now looks extremely nice. - Overall lack of gloss makes much of the interface look nice and minimal. Things I honestly don't like after using this for several weeks: - Helvetica Neue. I don't like it even on high resolution displays. It's just no good at small font sizes. - The paper texture in Notes and Reminders. Absolutely terible. - About a third of the new Dock icons, and many of the worst offenders are some of my most used apps (Reminders, Calendar, Safari). - Inconsistency in app titlebar usage. Want to get rid of title bars? Do it! But do it consistently. - Some grey-on-white (like in Stacks) that is difficult to read. - A lot of the transparency is pretty tasteless and distracting. Menu Bar transparency especially, good thing there's a setting to turn that specific part off. - Various lag/UI popup issues regarding transparency performance, like when opening the Safari sidebar (popup) or activating Mission Control (lag). - Some of the gradients look like crap. For example, checkboxes and comboboxes look ten times better with "Increase Contrast" enabled because they have that tacky gradient on. - Green menu bar charging battery icon, language flags are still colored. Why?