Nasty thing about dogfooding public OS Betas is generally most of the core system stability is already done. There are a few thousand people who have already done the self-host/self-toast testing on that.
Instead most public betas are focused on testing upgrade/migration issues, app/driver compatibility, and oem development of drivers and installations. The latter is what bites the worst - often OEMs aren't ready with fully-functional drivers until RTM or beyond.
If you're running only one machine I wouldn't recommend you take Beta OS bits. You might be lucky and find your installation is just fine - then again you might hit every branch on your fall through the unlucky tree and find that your critical applications or hardware just doesn't work.
Bottom-line is that you have to be prepared to FDISK the whole damn lot and start from scratch. If you're not prepared to do that - then don't install.