I have a 165 and I am going to snow check a 154. If you have always liked 153 or 155 sleds why do you want a longer one? I assume you have rode longer ones. Depends on what you want out of it. Everyone always asks this question and it is always the same no matter which brand. 150s sleds are a more playful and nimble all around sled. The 165 is more forgiving but less nimble. They climb better and will pull off a gnarlier line, in the trees, easier.