Following up on Justin's post, (for those who don't know, Justin is the Super at our club) I was greens chair for many years before Justin arrived and remain an active committee member. Our old greens which were a Washington Bent poa mix had roots in the heat of the summer that would shrink to less than an inch. We were growing grass hydroponically and we had a super who was a legend in the Chicago area. Justin already talked about the winter issues. Now, with continued top dressing, XGD and the new grasses our roots exceed 8 inches and would likely go deeper but for the clay in our pushed up greens. So at least in our experience, the. new grasses have been a significant improvement. As an aside, I was one of the last guys to be convinced to approve the change