This is a review of the January 2013 beta, but it looks pretty similar to the final version. Notebooks seems to be developed by one guy, and it’s a complex app, so it’s reasonable for development to be slow.
I tried the desktop version this morning. It’s nowhere near as sophisticated and polished as the iPad and iPhone version. It’s pretty basic. But basic is good for me for a writing app. Like John Scalzi said: I just want to type. Nearly all my writing is plain text with very light formatting; I don’t need layout tools or complex formatting. To this day I am uncertain how to use stylesheets.
I get the idea that the desktop version is still in development and features from iOS will make it in there eventually. But my rule is never to commit to an app based on the developer intentions. I decide whether to commit to the app based on what it does now. And what it does now seems OK to me. I’m not in love yet, but I’ll stay with it.