I love these threads... "Convince me...". Or, put on your big boy pants and make a decision... Blame shifting...
First of all, it's THE FIRST DEVELOPER beta of the new OS. That alone should make you wary of installing it. Secondly, if you are not a developer, or don't work with/for a developer (or haven't ponied up the $99 annual fee to be a developer), you have no legal access to the beta software. Finally, the beta process has historically been a bumpy ride - a good release, a bad release, problems with third party apps, etc.
If you can get it, knock yourself out... I don't care either way.