There has been a deluge of web chats lately (which is a good thing). Has anyone tried Let's Talk, Shout, Echoplex, and/or Kaiwa in practice and have some exper

There has been a deluge of web chats lately (which is a good thing). Has anyone tried Let's Talk, Shout, Echoplex, and/or Kaiwa in practice and have some experiences to share? Stability, searchability, general functionality?