I had kept one machine running SL until yesterday, but I don't have a really good excuse not to bring the workhorse up to Lion, so I finally did it. Farewell, Snow Leopard!
Even so, I have a lot of reservations about the whole gig of Apple dragging our laptops kicking and screaming into a post-computing era. There is a difference between simplifying things for novice users and dumbing down the planet. Sometimes, imho, Apple goes too far towards the latter. As long as there are still OPTIONS to see behind the glossy iOS look of a new OS, fine. But I wonder how long that will go on. I'm too old to rebel and write my own OS, but defintely not too old to shop around for one if I get to where I can't tell the difference between my iPhone and my laptop. For awhile, smartphones were getting smarter. That made sense. Now they're trying to dumb down their ancestors. That's an overreach. At least for another couple decades, I would say.
On balance, I'm as ready for Mountain Lion as I can be, as of yesterday afternoon. I'm really looking forward to some of the ML features but I'm only going to upgrade one machine immediately. I'll probably take a MacBook Air there first. It's a machine I don't back up because it gets everything it has on it from the workhorse or from a machine I just surf on.
Remember that cereal ad from way back when, with the two little brothers shoving a bowl of something or other onto the tray of their youngest bro's highchair? "Let Mikey eat it..." That's how ML will happen at my house. Let my no-backups MBA eat Mountain Lion first, and then we'll see about the others.