Hi & welcome to Epic
I owned the 175cm last year. At my size, 230#'s, that length was good for me. It will make nice round turns in that size. I found it would produce a wider range of turn shapes than the 175cm WC RC that I had owned. Shorter turns required extra attention, but were doable. A great ski for faster skiing out west, I would want something a little more eager to make short turns if was skiing in Vermont.
I have not skied the 170cm size, Dawgcatching & BWin-PA own the 170cm size and have told me it's much quicker than the 175cm size.
What is your size/weight and where do you ski?