First, I feel great that Apple offers the update for free. I went from Snow Leopard directly to Mavericks so I actually got three updates in one and that for free, which is awesome.
5 GB download and installation went problem free and seamless on my Mac mini late 2009.
The few obvious changes I noticed:
1. Booting up seems to take a little longer than before, but I can live with that.
2. Using the activity-measuring tool it seems like more RAM is used than...