I went to red bud mx park a couple of days ago. There were atv races and in those races the 400ex's were almost last. There was one polaris there and he came in last. My friend has a 400ex and I have a modified blaster. He the machine looks slow, but I havn't been able to race him because I broke my arm days before he got it. Everyone that I know says that 400ex's are no good, don't buy one and these are people that have had one and moved up to a banshee or dirtbikes or somthing else.