im 5'10' and ride 179s mounted true center. some people are saying they measure to 183-184 but its a little longer than that, standing next to my bacons, which are 182, they are still a sold 4-5cm taller. I ride them all over, park pow chop you name it and they are a lot of fun, never had any tip dive in pow. However, they do flex a lot in low angle soft snow, meaning the tip kind of flexes up and acts like a brake, forcing me to go a little backseat to maintain speed. I do not know if this is just because i have them mounted forward, or just because the ski is soft. Besides that I have no complaints and I would definitley go with the 179s. The 189s are going to be fucking windmills in the air.