The 600S remains a bit cold-blooded on the first start of the day, however. While the low end power is usable, if initially a bit fluffy, the engine betrays its GSX-R heritage by delivering the biggest hit above 8000 rpm. If you want to make time, or pass quickly, a downshift—or two—is in order. Fortunately, the transmission works effortlessly. Vibration, however, rears its ugly head throughout much of the midrange, which means that highway cruising can be a buzzy affair.