I was on a gsxs-s 1000 site a while ago...I had nearly purchased one a few years back but report of a terrible off/on throttle kept me from it. When I spoke with a national rep about it, he said "because of trying to meet emissions the fueling is the way it is", but said a power commander fixes it. Anyways a few of the guys on that site mentioned that the Z900 also had a bit of snatchy throttle, which I hadn't really thought of. I have also a Ninja 1000 and have to say the Z900 is kind of snatchy on-off compared to it. Maybe it was only a few models, not sure, still a great bike.