Buttons have a very liquid 3D look to them. Everything seems to have more depth to it with smooth translucent drop shadows. Instead of having a grey bevelled edge, default buttons softly throb like the power button on a new Mac when it is in sleep mode. Even the installer has a wavy watery animation and blobs of water oozing back and forth while you wait for it to finish its task. Apple has really polished their OS to match the stunning look of their new computers.
Installation is easy.
Since Mac OS X is a truly multi-lingual OS, the first screen asks you what your primary language is. As of this writing, the choices are English, Japanese, French, German, Spanish, Italian, and Dutch. More languages are sure to follow. After selecting your language, reading the ReadMe, and agreeing to the license agreement, you get to the actual installation screens. There are very few customizations to make, so I just clicked install.