I've tested the WT147 a few weeks ago and I have to admit that I wasn't impressed. After owning an Empire 144 custom (mojo), having tested a 144 SOS custom last year, and currently riding an X-Shooter 144, I still prefer my X-Shooter. the WT felt stiffer, heavier, and these pads and straps are very uncomfortable. On the other hand it does rip the chop pretty hard, but my knees needed extra care afterwords. I could ride the X-Shooter for 4-5 hrs in Cabarete with no signs of fatigue, but 1 hr of WT147 gave me the works.
On the SOS subject it felt a lot like my Empire, although like Sean had said "if you like your Empire, you will love my SOS".
Just my personal experience.
For light winds I still prefer my own creation 154x42, Divini/S-glass, but I am biased