Originally Posted by JoeK
Is there an advantage to using a beta? Do you get free upgrade to the original for participating?
As mentioned, there is 0 advantages. Well.. you get to voice your opinion on what you like or don't, and if you encounter bugs... So you are making your own experience, once it's release, better (well, MS wont' listen to every single minor thing, but if their is a outcry or high demand, they might implement it. It's more focus on bug fixes though. The interface/experience change feedback, should have been said on their blog site)
In addition, you just get to know before everyone what is Win8, how to use it, be comfortable with it, show others the cool features that you found out.