technically speaking you aren't supposed to even try that OS yet, let alone judge it (I'am assuming you are not developer, for obvious reasons) If Apple could somehow give it ONLY to developers who desperately need it for their work, you bet they would.
Not trying to counter you, but take my case.
I've an iOS developer account. When I was downloading iOS 8 beta, the same page offered me a promo to click and download Yosemite, and I did that.
I'm using it on my primary machine, and so far it only has some minor bugs, but still apps are not crashing like on iOS.