I finally decided to upgrade my Mac Pro and MacBook Pro (2010) to OS 10.9 since 10.10 is coming out soon. Unfortunately, I discovered too late that upgrading my MacBook Pro (2010) to OS X 10.9 was a costly mistake. After upgrading, I started getting GPU panics, causing the MacBook Pro to restart, I did a web search and found out that the MacBook Pro (2010) had a known documented hardware fault in the graphics on the motherboard and that OS 10.9 was causing GPU panics for many people after an upgrade. In all the cases, downgrading back to the original OS did not help. After going to an Apple store, the only recourse I had was paying $310 to get a new logic board installed. The regular hardware test Apple runs does not catch this problem but the Apple VST test will indicate if your 2010 MacBook Pro has the hardware fault (i.e. if you really want to install OS 10.9, go to an Apple store and have them run the VST test. If it fails, do not upgrade).