For all of Mountain Lion's iOS-derived goodness, one highlight plenty of folks would love to see in OS X is still missing in action: Siri, the voice-controlled personal assistant.

CNN: Review: Mac's Lion adventure continues

It's also being positioned as the upgrade that will cause the Mac-loving masses to fall in love with OS X and make the transition from their beloved "Classic Mac" environment.

FORBES: Magazine Article

Overall, the machine sports a retro-futuristic look sure to appeal to Generation X fans of the Jetsons--the same crowd that brought back bell-bottoms and fell in love with Volkswagen's recent update of the Beetle.

FORBES: Back to the future