With the recent scare with Hubble's computers, I'm sure many astrophysicists are breathing better with this announcement. Even with the crazy good pics we are getting from Hubble, the Webb telescope is more than a couple decades of improved in technology and capabilities.
Success!!!! For me the thrill of a lifetime. I have been following astrophysics for decades. A failure would have been personally devastating. This thing will be able to see back in time 13.5 billion years.