Installed the Lion upgrade on my iMac this morning, though not without difficulty ... the download crashed the App Store application! My initial thoughts are mixed. Safari seems much improved, and the left/right swipe action there is brilliant. I'm already used to the "reversed" scrolling, but I re-enabled the always-visible scroll bar ... it makes no sense at all to have that disappear on a desktop device. Launchpad is useless for anyone with more than a handful of apps, and since I don't use Spaces I don't really like the new look of Mission Control. Mail seems more solid, though I went back to the classic UI there. There's a lot of serious ugliness in the UI, especially for a design-conscious company like Apple. The Finder and Mail went way too far towards the monochrome look ... the font choices, spacing, and graphic layout all suck. On the other hand, Apple went too far in the other direction in the Address Book and iCal, sacrificing usability and ...