I decided to give the beta another try and immediately went back to the old interface. Evernote is not primarily a writing tool. If I just want to write, I'll use a word processor or a text editor. The beauty of Evernote is storing and organising notes, and the new interface makes the latter harder. As many have commented eslewhere, if you've spent a lot of time setting up a hierarchy of tags, then having someone flatten them out just because it looks nicer that way is not a help. Please please please bring back the old notebook and tag hierarchies!