I have long been looking for the perfect editor for my Mac. Ever since I bought the latest Macheist bundle I have been using Espresso, which has been working fairly well. It is a very immature editor though with lots of essential features missing.
My first experiences have been very positive! It has innovative features, looks good and does its job very well. I especially like the excellent Subversion integration and remote support via FTP, SFTP etc.
When I have used Coda for a week or two, I’ll write a proper review with images and everything.