I don't know if I'm ready to trust it. I put the Office 2007 beta on my laptap. It bogged the system down really bad, so I uninstalled it. It didn't uninstall right. I had Office 2003 and XP installed, and neither will work at all. Office 07 shows up in my add/remove programs list but when I tell it to remove it says there are no files to remove. 2003 and XP won't reinstall correctly at all, at least, not that they're useable. I spent several hours deleting Office registry keys, and barely made a dent in the total. Other than Open Office, I get the feeling that only a reformat of my laptop will fix all the problems the Office 2007 beta caused.
And so, I'm not even about to trust the Vista beta.
I'm working on switching to Linux, which will be slow. Linux doesn't work with wireless very well, but I need wireless support. I'm installing a Solaris DVD on my older laptop to see if it will do what I need. Since everybody but MS and Apple is going open source, it will benefit us all.