Sportbike rags don't consider bikes like the Ninja 250/500 "sportbikes" because they aren't used as top-level production racers and have been unchanged for years.
If your riding experience is limited to the MSF and a few miles here and there on other bikes over the years, then do not start on a 600cc sportbike of any type. They aren't starter bikes despite what your friend and the magazines say.
Your first bike should be cheap and easy to ride. I highly recommend the Ninja 250, 500 or GS500 as a first bike for someone wanting to ride a sportbike. The Ninjas especially will allow you to develop good clutch and throttle control and play with the powerband until you have the finesse and ability to handle the touchier and bigger sports.
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