Track size is always a funny debate to me. I had an 07 151". I liked it fine. In 08 I went to a 146". Then again in 09 a 146". The 146" is the best handling of the 3 sizes. You get better track speed and better handling from a 146". I am not trying to be a salesman, I am just calling it like I see it. I think the 163" is a joke. To much track to throw around. My 09 146" will destroy any stock 154"&163" powder, hard pack, you name it. Scouts honor. To each his own. Look for the sled in Summit HD's new film, Extreme Teams new film. Possibly other films, I am not sure where all the footage is going at this point. You will see for your self how incredible this sled is. I always find it impossible convincing people of how great my sleds run. Why would I have a sled that doesn't kick ***? I hope someone ends up with this deal.