Considering it is actually an upgrade from the launch console that's not bad.

seems an amazingly low number of tradeins for a top end upgrade. Was expecting much higher, I am sure MS are pretty pleased with 60%+ new buy ratio of this.

You do realize what the stat is? This isn't even an guarantee of completely new owners, but that more than 1/3 of their sales were from people trading their current stuff in. That's not growing your base, but it does mean you have a lot of hardcore fans willing to double dip.

How often do you think gamers buy preowned consoles? I have never bought one (just preowned games) 

Exactly, and that doesn't include privately sold consoles or trade ins at other retailers. 

So they do these trade ins to throw the traded in console away? Why do people bother putting their console on eBay. Which brings me to that percentage of people upgrading is higher when you add in the people that sold their consoles through eBay to upgrade to the S.

63% new buyers isnt a small amount. Thats pretty good especially since the Slim is selling well. I put it under a good success and im sure MS do aswell. 

Number will only increase with more 4k content hitting the homes.

So how much of that 37% was from Xbox One fat versions being traded in? That would be interesting to know.

NPD is coming in less than 2 weeks. I wonder how well the Xbox One sold.

It is a good upgrade, a 2TB HD + 4K Blu-ray player and  40% smaller than the Xbox One.