Looks , power , torque , tunability , aftermarket , weird looks. Main reason is weight and riding position. Its comfortable for long trips and the gsxr1000 is way to light. My last bike was a zx12 , anything to light i try to throw around corners hard when i dont need to. Ive ran right on the ass of my friends 04 R1 in the twisties on the hayabusa tho , and its still 100% stock so far