I use my early 2009 Mac Pro for work, and I always like to give Apple a little bit of a buffer on new OS X releases before upgrading in order to make sure there's no huge bugs that somehow make their way to the final release. I haven't really heard anything so far about huge system-destroying issues so far, so I'm wondering if it's safe to go ahead and make the plunge. I'm really looking forward to the upgrade, but I want to make sure my work computer won't be out of commission.