Pros: - Much, much better trackpad gesture, but the defaults are screwy. However, the new options provided almost completely remove my need to use BetterTouchTool. Almost. - Mission Control feels great so far, for the most part. The ability to organize Spaces in two dimensions is gone, but it's less important now that Spaces are easier to create at will. It's much easier to move apps between Spaces now, too. - Resize handles on all sides of the window! Now, was that so hard? Related to this, the new thin scroll bars are nice. - I'm very excited about the new paradigm for handling documents, but since I hardly use any of Apple's applications, I guess I have to wait until third-party developers catch on - Mail has won me back as a user from the horrible mess that is Thunderbird. TB is much more powerful, and I will miss my plug-ins, but its user interface is horrible and Mail's just improved dramatically. - I like the new option to automatically cycle through desktop images. A 30-second option would be nice though, as would the option to animate. - I can see full screen apps seem like a good idea for those programs I always keep open. Right now, that's just Mail, but I'm going to really be psyched when Evernote implements it, or when there's a good chat client that has it. Cons: - Launch Pad is pretty much useless. By default, it dumps all of your applications onto screens, more or less randomly. There is no easy way to organize things in batches, and it is not customizable - Here's something that is really, really stupid: if you use multiple monitors, you would think you should be able to put a full screen app on one (like Mail, DVD Player, or something) and do your thing on the other screen, right? Wrong. Apparently, when you full-screen an app, the other screen gets the blank, gray linen Mission Control background, and you can't do anything on it until you exit full-screen mode. Unbelievable. - "Natural" scrolling does not feel at all natural, especially because keyboard navigation still scrolls the viewport, not the content - Can we get a Scanner app? It's weird to have to go through System Preferences to scan - When in full screen in Mail, you cannot get back to your inbox while you are composing a message, not even in a split-screen mode - No keyboard navigation in Mission Control - All windows Exposé is gone. This came in handy at times. Mission Control probably obviates some of its usage, but why throw it out completely? - Mission Control won't let me organize my Spaces/full screen apps as I see fit. It seems to be constantly shuffling my full screen apps, and I'm not sure I understand the logic it uses yet. Wish list: - Here's how multiple monitors should work, in my mind. Both screens should have access to Mission Control, and both screens should be able to access all the same desktops. Heck, put a little lock icon up there to lock the two together for mirroring. Now you have twice the flexibility. - Please, can we finally have a Finder preference to put folders before files? It's such a simple thing, yet it's so annoying to not have a choice (just as I'm sure native Mac users are irritated about the lack of choice on this in Windows). I use TotalFinder to get this behavior in my Finder windows, but there's no way to change it for Open/Save dialogs. - Options to change the Dashboard and Mission Control backgrounds would be nice. And how about a few more Dashboard options, like maybe extra Dashboards you can get to by swiping up and down? - Apple is generally not shy about pulling the rug from under users and developers when they decide they want to "simplify" something. Well, it's about time they fix the horrible kludged up mess of shortcut keys. Some standardization would be much appreciated--Windows has a much more consistent scheme. - Why can't I decide to let another app besides iTunes use my media buttons? It should be my call. - Can Mail please get a more fine-grained setting for when to retrieve messages automatically? Or at least different settings per mail service? I want updates every minute for services that can support that, but some of my e-mail accounts won't let me update that often. I shouldn't have to choose the lowest common denominator. - Full-screen iChat. But then again, I probably wouldn't like it and I'd just be waiting for full-screen Trillian, anyway.