the company i work for uses the services of a Swedish company and I've been out there a few times and on one trip we got served that, it's really not as bad as people make out, although I wouldn't try eating a whole plate of the stuff. We were at a corporate event in Stockholm which included a trip by very fast RIB (strongly recommend it) to the restaurant were we were served it with a bunch of other stuff and loads of local booze. I did have some weapons grade farts the next day though but it was a very boozy affair.
just on a minor point all the Swedes I met seemed to be crazy keen on boats and particularly keen about fast boats. They used to have these insane Motor Torpedo Boats which are fitted with three turbine engines, there are YouTube videos out there of them and well worth a few minutes of searching for, the sound is incredible.