So, what's the differece between the Diavel and a street or naked bike? The Diavel looks like the Yamaha Fazer (the Diavel has even less wind protection) and (at Yamaha) the FJR1300 is the sport touring model, not the Fazer.For me it classifies as a sport tourer. I even had a backrest for a passenger. But, then again I come from a long line of very aggressive sport bikes. It just depends on a person's abilities / preferences I guess.
I don't like sport touring bikes (had one), but probably would like the Diavel, if it wasn't Italian.