Higher-end Jib deck.
I rode the 154W as my primary board this summer riding park on Mt. Hood. It excelled on the rails and jibs, but got a little loose on the bigger jumps and bumpy conditions. More responsive that your average reverse camber, possibly due to the carbon-fiber in the tips, but still felt fairly soft. Its actually a flat camber which I liked on the rails because it had a skateboard like feel.