Finally, I got an invitation and I am trying it. One problem that I have is feeling that I have to read email as it arrives so I find myself not running an email client if I am really concentrating on work or writing. With the new display, I will only see emails at the top of GMail's form if they are deemed important because they are from people I always respond to, etc. I is also convenient being able to switch back and forth between the old style inbox and priority inbox.