bought CO7 few days after launch. Lesson learned, NEVER buy a newly launched software, CO7 is slow, running it on a 17" MacBook Pro with quad core and 16GB of RAM and a SSD drive. Improvement in some area over shadowed by the slow performance and poor stability. Whether I was shooting tethered or working on images, the software crashes. The tether shoot crash also mean some last image was lost. Restarting = wasted time. Been communicating with support to resolve issues. Word of advise, stay away from CO7 for a while more. CO6 still rocks ! I am going back to CO6, which means worked files are not backward compatible so will need to re-do all the work but at least I won't be as frustrated.