The team boss actually specifically stated one of the reasons why they went with this pipe is that it is stronger. They have had a lot of problems with pipes breaking, similar to members on the forum. Other reason was power curve.
I don't like it. Don't get me wrong, I have always loved under seat pipes but this specific bike was not designed for it.
And, what happened to weight up high and all that ....? Would love to know why they had to go this route, obviously performance gain....