This was a basic road bike built in the 1990s, based on a tuned version of the DR350 engine. The name comes from the shape of the sidecover- supposedly imitating the Gooseneck curve on the Isle of Man. I think it's a pretty good looking bike aside from the weird crowded, kinked look of the headpipe.
We never got it here in North America but I expect it would sell well today, maybe utilizing the DR400 engine. (and fix that exhaust pipe!)