DO NOT UPGRADE TO 10.9.2
I have upgraded to 10.9.2 on my newer Mac Book Pro. My wireless disconnects without warning. My thunderbolt display and the connected LaCie drives eject themselves if the system goes to sleep. My HP Scan wont work... My Dreamweaver doesnt work. I had to change the permissions for my printer to work. IF I WANTED THIS I WOULD OWN MICROSOFT NOT APPLE!