For those using Beta 1... Does El Capitan run stable enough to use as an everyday operating system? Mail works? Most programs work? That seems to be the case from what I am reading thus far, though I want to be certain before installing it. And, yes, I am well aware one should not install a beta as an operating system. And, yes, I am well aware that it's best to install it on a second partition And, yes, I have a copy of it outside of being a developer -- and so do many others -- so no speeches. I would have waited for the regular user beta in July, but if enough of you think its stable enough to run, I will back up my current Yosemite and then install the beta as the main operating system. Thanks in advance to those who are cool enough to answer this question without the normal warnings.