Works well, as long as you're focused.
So yeah, the airport…read moreis functional. Security is quick, the gates are easy to access - you can be at your plane within 15 minutes of getting out of the train station.
The flip-side, there really isn't that much *in* the airport. It's tiny (tinier than Tegel!), and, well, it's tiny.
That said, if the weather is nice, you can hang out outside till your flight is about to board....