Been using it for a month now and I love the modern sleek interface. It's very similar to Postico (which is Postgres only unfortunately). One killer feature for me is that you can assign colors to connections. When you open a window this color is prominently displayed at the top, very useful for distinguishing production and dev. ⌘+P command prompt is also supported, like in Sublime Text. Some nice touches is that you can assign custom icons to connections and that empty space is filled with cute drawings. One thing I miss is that if you don't specify a DB in the connection info, the main window doesn't list all the available DBs, you have to ⌘+K to get the selection panel.