I've never used a "low" shoe, only boots that come up over the ankle a bit. And they are great when the temps dip to freezing and below where the overshoes are not as effective (for me). They are convenient, and I find that as the temps go below freezing they work much better...to a degree. There is a point where my feet still get cold, but that is usually hours into a ride. Key is the socks. For me, thinner socks just seem to work better, I use merino socks that provide a thin insulating layer, but not so heavy that my feet just sweat and soak the inside of the shoe.