I don't know too much about the 360 kawi, but have friends that have the 650 and i just recently had the 750 and they are very good quads. The 750's have some issues burning the belts (mostly from the wrong driver input) and in very hard driving the front diff can be the weak spot. Also the tie rods seem to bend easliy.
All in all a very fun powerful decent machine, sorry i couldn't help more.