Quick friendly service, plenty of seats inside and out (can always sit on nearby benches in pedestrian zone if not)
Burgers are brilliantly priced, tasted great and have original packaging.
The burgers aren't quite the same quality as Helvti, Korner and co, but they're half the price and only a franc or so more than the rubbish at McD/BK
Not only that, but if you want a quick lunch, you'll be in and out far faster than some of the burger 'restaurants' in town.
Would go again and would recommend - great for lunch if you're in the Enge area, it's right outside the front of the railway station.