I agree with the above posters saying that you just have to try one to understand. For me it's a combo of the torque, powerband, feel, and sound that leave me only wanting a sport twin. I'm on my third now. I4's haven't ever been a consideration for me since the day I got my first one (1st gen SV650 followed by TL1000S and now KTM Superduke). No arguing that there are many fantastic I4 bikes out there but they're just not for me. Triumph's triples would be interesting to try one day.