With the Win 7 Betas I got every one I could beg, borrow, or "steal", Win 8 doesn't hold the same interest for me...YET.
I installed the WDP, uninstalled it, re-installed it, and finally decided to leave it uninstalled. Once the public beta comes out I expect my interest will peak again.
I have to admit, there was a certain "fun factor" when installing a Win 7 beta version that had been leaked half way around the world. The forbidden fruit always tastes best...
Learning something before my grand kids do is a big beta plus.