[justin0469]

Lion to Mountain Lion. I'm not that far behind and I think it's fair to expect a product which has been available for quite some time and shipped with my brand new laptop should be more stable and lived up to hype. That being said, perhaps the problem was believing all the Apple hype that is spread - I had my expectations set too high.

[Samuel_Michon]

In my experience, Mountain Lion is a lot more stable and smoother than Lion. Best $20 I've spent all year.

Mountain Lion also adds some cool features like iCloud and iMessage integration, and my personal favorite, Power Nap:

"When your Mac goes to sleep, it still gets things done with Power Nap. It periodically updates Mail, Contacts, Calendar, Reminders, Notes, Photo Stream, Find My Mac, and Documents in the Cloud. When your Mac is connected to a power source, it downloads software updates and makes backups with Time Machine. While all that updating is going on, the system sounds are silent and no lights or fans come on, so nothing disturbs you. And when your Mac wakes up, it’s good to go."

http://www.apple.com/osx/whats-new/

[justin0469]

That does seem cool in concept but when I put my laptop to sleep, I do so to conserve battery not for it to suck up battery by doing all that.

[evan_]

It throttles the CPU way down, keeps the screen off, doesn't spin up hard drives- in practice it takes almost no battery. Even so, you can turn it off, trivially.

I don't know if you think that everyone urging you to upgrade is lying to you or if you're just being obstinate. It's OK if you don't want to upgrade to Mountain Lion but stop complaining about problems that have been solved.

[Samuel_Michon]

I haven't noticed any meaningful drop in battery from this feature. Also, if you have Power Nap turned on while on battery power, and the battery level reaches 30 percent of capacity, Power Nap will be suspended.

However, Power Nap only works on recent Apple notebooks with flash storage and cool microprocessors (like your MacBook Air).

http://arstechnica.com/apple/2012/07/os-x-10-8/18/#power-man...

http://www.macworld.com/article/1167970/up_close_with_mounta...

[Osmium]

If you're really worried you can disable it in System Preferences, but the latest Intel processors have new "active idle" states specifically for this kind of thing.

[leephillips]

I'm guessing that by "connected to a power source" they don't mean the battery.