The beta is pretty stable but you would need to be using clover or chameleon to boot Mavericks as the Tiamo boot.efi method does not currently work with Yosemite. If it is to be your primary OS then I would wait till the GM release.
Thank you. Then, I'll wait. I'm curious, but not enough to take the risk to have to reinstall all my computer . And normally, we should have just a little more than one month to wait now ?