Firstly, I don't like Mavericks for many reasons and don't believe in upgrading just to have the latest and greatest. I'd rather stay with ML where my new machine runs much more smoothly, and I can still have a 2D dock. In order to have the current version of iLife/iWork I'm forced to upgrade. I think that's lame to exclude customers who want to stick with the OS their Mac came with. I'm sure there are technological reasons why but still, very unfair to users. Maybe it's the compressed memory?