The keel on the mountain skis is ever bit as agressive as the saddleless trail models. It is almost 90% as well which really cuts down on pushing in soft trail conditions. The only downside is when attempting to carve or sidehil in crusty snow conditions, that big ski acts like quite a lever when it catches. I have gotten used to it though, and you just always go positive never let the skis go neutral and it works very well. The only condition that I have found the C&As to be better is in melting snow conditions such as snowcross tracks, and warm spring days.