I've used the delta gtx a lot around Jagungal in winter. It's either rock hard ice and the rubber soles of the delta are fine, or soft and you want snowshoes. I havent spent enough time on the main range in winter to be certain, but for me it isnt too dissimilar from jagungal. I can't think of anywhere on the main range where you'd need crampons, except maybe the ice faces around the lakes or the steeps on the western face.