Depends. For me, I have tiger set up sooo sick on my book... and i'm prob gonna get a new laptop in september (2008), so I figure why spend the money to upgrade now... when if I wait just a little longer, I'll get a new computer that comes with it, and all the updates that have been released since. I'm not gonna bother with it. It does have some really good features that are really appealing, but it isn't thaaat different - not enough for me to change.