The ZZR 600 is great even if you are a beginner. Take care of it and you need not upgrade for a long time. Go easy on the throttle until you gain more confidence. There is lots of power when you need so it´s a great buy if you can afford it. This bike can beat/match even 750s and 900s on short sprints, of course it will lose out on top speed, however, you can cruise long distance at 200 km/h. This is one of Kawasaki´s best selling bikes.