Friend of mine just bought one of these. He is the second owner but the first owner never had the boat on the water. My question is he complained about a vibration when he first puts it into gear but it smooths out once running. I went for a ride with him last night and notice that there is excessive play in the prop/hub relationship. We pulled the prop and looked at the thrust washer and popped the rubber/composite hub from the prop and everything looks normal so we put it back together and went for a ride. It does shake the boat when first put into gear but not horrible and once any amount of throttle is given it is glass smooth and the boat ran very well. He has the 150 4 stroke and I believe the prop was a Tempest 23p. Is it normal for these hub kits to have play both side to side and for and aft? I have read where the 150 4s have a bit of a rougher idle speed but otherwise it was very nice. I was very impressed with this boat and I am excited to spend more time in it. He is still breaking in the motor so he didn't get after it too much but it seems like the boat is going to be a rocket.