Well, after about years of being an Apple Public Beta Tester on my MacBook Pro, all has gone well. There have been a few bugs, but nothing that you can't get through until the newest release.
No longer.
I recently had to wipe my entire system and reinstall through Time Machine because the initial installation of High Sierra Beta froze and failed. I have definitely lost faith in their Beta program being at least well enough baked by release day for consumers to trust that they won't have to completely reboot their drives.
And what is more, unless you are a "Developer", the beta program support line won't even help you. It's like the beta software program customer service has forgotten that they are part of apple, which is known for their customer service. If you are going to have a Public Beta Program, you need to have a support help line for them as well. Just common sense.
If you still want to upgrade to the Beta software, my recommendation, wait for at least three releases before touching it.