It is hard to imagine Amazon ever catching up with Google's knowledgebase. I really like being able to ask about traffic wherever I am going while I am getting ready. And it will find any podcast I wish to listen to with just the name (even part of the name sometimes).
I have already added a second Home and really enjoy the whole house audio, and the skip/rewind commands, not to mention the better audio quality. I can even cast files on my media server without Plex, iTunes, or any other host app!
The one thing I thought I'd miss the most was my custom skills with SmartThings, but have created new SmartApps that do the same thing through HAM Bridge.
The Echo is almost superfluous at this point.