Works very well. Out of the clients I have used on OS X, this is the best one. I was used to using the Semagic client for Windows, and I've tried iJournal and xJournal for OS X.
Two are a few things in Semagic and xJournal I would like to see added in this client.
1. In the Edit History mode. I would like to see an icon beside the entry lists that shows what "security" setting the entry is set to... public, friends-only, or private.
2. An Edit History interface more like xJournal and the ability to edit more than one entry at once.
3. Changes in friends.