There are several posts and videos of guys that used that mod. So far I haven't seen anything that says anything negative. With that said, if my memory serves me correctly, Hobie will not give an opinion on the mod because they did not test any sort mod on the P14. It can't be certain, w/o testing, if the structural integrity of the deck/hull will be compromised from the mod. I am not sure if Hobie will cover warranties on damages caused by using the mod. Again, all this...I think I have read before on these forums...so don't quote me (disclaimer
Personally, I have no problem using the OEM seat. Since I have the H-bar, standing up is easy... I can see, however, the advantage of having a higher seat for standing... That's one of the reasons why the seat on the PA12 is so attractive. If an official Hobie chair is produced for the PA14, I will be all over it...as will every other PA14 owner around the world.