Benefits of Squatting with shoes that have a heel.
I noticed over the years that when I Squatted (high bar shoulder width stance to parallel) with a heeled shoe, I really felt my quads light up like a Christmas tree, but when I Squatted barefoot or with Chuck Taylor's I didn't feel it nearly as much. I noticed the quad development of Olympic lifters, and then I discovered they Squatted with heeled shoes (and front squatted). See the connection here? You get the benefits of Squatting with a raised heel without the torture on your knees that elevating your heels with a 2x4 or a plate inflicts.