What I notice about the Yamaha ski is that because of the raised sides you lose a lot of the float potential. With the USI's my Apex's front end actually floats in the POW. Never thought that would be possible. When ditch ridding a few weeks ago I noticed that the Phazer (Yam) skis just wanted to sink, unless I really leaned back I couldn't float the front end. Not saying that the Slydogs would float but I like the mounting system and adjustability the USI's provide. Everyone seems to be affraid of them on here as they think that they are too aggressive, and while for my Apex some may not like the added steering effort but I can adjust that out. As for the Phaze, personally I think it could use more bite in the corners.