I recently upgraded my Macbook Pro’s operating system. The upgrade cost was an incredible $29, an order of magnitude cheaper than Microsoft’s latest upgrade. And, it is not just an upgrade, its a full install too. I popped in the DVD, and an hour later, my laptop was running OS X 10.6. I ran the software upgrade tool and everything is fantastic.
One of the reasons I upgraded was the rumors surrounding the necessary disk space needed for the OS was reduced. I gained an additional 10GB by installing the update. Additionally, Mail seems to run much faster.
All in all, it was an easy enjoyable experience to upgrade my Mac. It was very easy and anyone could probably pull it off. Just remember to backup using Time Machine before you run the upgrade.