Everytime when Apple releases new software, I can’t help it to format my computer. I just don’t seem to trust an update of a operating system. I like to create a bootable USB drive because it’s blazing fast to install an OS. For Yosemite, it took me +- 15 minutes with a USB3 stick.
Luckily it is fairly easy to create a bootable USB drive for OSX 10.10 Yosemite!