Is Mountain Lion finally a worth-while update?

Now that 10.8.2 has been out for a while, is it "safe" to update? I currently am running Lion, and while I'm happy with it, I'd like to take advantage of the newer iCloud features in Mountain Lion that integrate with iOS 6. Is Mountain Lion still known to decrease performance and battery life like it has in the past? Gripes with notification center and the "iOS-ness" aside, will I regret dropping the $20 to upgrade?