I have MBP running Maverick right now. My question is should I stay with Maverick or should I upgrade to Yosemite?, for you guys that already upgraded to Yosemite, is there any improvement on performance? is there any apps that is not supported by Yosemite? I need to know the advantage of the new yosemite. Like the iPad air, after upgrading to IOS 8,now IPhoto is not working anymore. I need your input and suggestion from you guys what you think. Thank you and I really appreciate it.