Well said Daisy. I have been around bb's and Gym's for 20 years and have never met anyone who knows everything. Including pro's. So anything that you can learn may get you one step further. I take everything I can and pick out what I want.
Miss24, I use 25's under my heels when doing atf's. I have poor hip and ankle flexibility so I have to. As far as knees handling it, atf is much easier on my knees than parallel squats. Here's a quote I love regarding atf's, "with parallel squats your knees act as brakes, brakes wear out", or "if it ain't deep, it aint squat!"